'clear barrier' is correct and can be used in written English.
It can be used to refer to anything that stands in the way and prevents someone from achieving something. For example, "He was unable to pursue his own career due to a clear barrier of financial instability."
"The mortar attack on Gilo is a clear barrier that has been broken," said Dore Gold, an adviser to Prime Minister Ariel Sharon.
Mr. Zappala said witnesses described the boy lunging forward, as if he thought there was some sort of clear barrier to stop him.
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.
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.
Which presents one clear barrier to reform.
As Lockshin explores the previous worldview (e.g., Chapter 2), we are faced with Aristotle, Plato, and Biblical Genesis, but there is no illusion of an easy, clear-cut barrier between old and new.
While there are clear barriers to action, including the complexity of working with huge, global agricultural supply chains, signs of change are becoming more frequent.
Responses have focused primarily on enforcement, but it is clear barriers and barbed wire will not deter people who are prepared to risk their lives.
If it is to be the last great chance, the uphill battle of the playoffs seems more daunting than usual, with San Jose and LA both presenting clear barriers to an MLS Cup final.
There are clear barriers to this closer relationship, and Kirby admits that as a scientist with one foot in the arts, he has been surprised by the "amazing differences" between the worlds.
