The phrase "a clear barrier" is correct and usable in written English.
It can be used to describe a distinct and easily recognizable obstacle or separation between two things.
Example: "The fence served as a clear barrier between the two properties, ensuring privacy for both homeowners."
Alternatives: "an obvious obstacle" or "a distinct separation".
"The mortar attack on Gilo is a clear barrier that has been broken," said Dore Gold, an adviser to Prime Minister Ariel Sharon.
However, the lack of meteorological data from ground stations is a clear barrier to the proper management of water resources in poor countries, increasing the risks of water scarcity and water conflicts.
Remarkably, in the three decades since the NRSRO tag was first used, the SEC has never defined what is required to get it, thus creating a clear barrier to entering the rating business.
When researchers placed African cichlid fish in a tank, the fish showed identical aggressive behavior whether their opponent was their reflection or another fish across a clear barrier, ramming and biting at both.
Author David Boyle, of the New Economics Foundation, told BBC News that he was not suggesting that all children should be coached to pass entrance exams into "super-selective" schools, but that the need for coaching to pass some of the tests was "a clear barrier" to some families.
At day seven post-infection, in mice infected with isolate 124A, the fungal cells were predominantly in the hyphal form and were apparently intact, forming a clear barrier to the progression of inflammatory leukocytes.
The sculpture is behind a protective clear barrier after a crazed man attacked it with a hammer in 1972.
When presented with people who live their life as their own sexual fantasy and you're not interested in a role major or minor, there's no reason to hate but there's a very clear barrier in front of you and it should remain there.
This was placed onto 2, 9 mm thick 6×25 cm Plexiglas spacers in a shallow aquarium that formed a channel below the clear barrier (Figure 3, outer aquarium not to scale).
The downward aim was measured from the vertically rotated head as it contacted the clear barrier, which took a mean of 26.3 milliseconds from strike onset.
Another tourist, Reinoud Noord, a Dutchman who said he had arrived in Rome with his family "10 minutes ago", was disappointed but stoical, ready to pose for a family shot in front of the clear barrier protecting the work site.
