The phrase "a clear opening of" is correct and usable in written English.
It can be used to describe a distinct or obvious beginning of something, such as a discussion, event, or opportunity.
Example: "The presentation provided a clear opening of the topic, allowing the audience to grasp the main ideas quickly."
Alternatives: "a distinct beginning of" or "an obvious start of".
(i) A door shall have a clear opening of no less than 32 inches and shall be operable by a single effort.
Suarez then had a clear opening of his own from Gerrard's delivery but he headed straight at Friedel, to his very obvious disappointment.
Torres got a clear opening of his own midway through the opening period when Mata cushioned a high ball and chipped into the area only for his fellow Spaniard to head straight at Schmeichel.
With Goldwater on his side, Obama sees a clear opening for skeptics wary of the extremism that has captured Republican hopefuls in thrall to the fundamentalist base that controls the GOP presidential primary today.
It is interesting that nearly 50% of patients selected E-mail consultations as preferred modality of information, which represents a clear opening to a possible alternative modality of consultation in many countries.
Modibo Diakité, part of a Sunderland defence missing the injured John O'Shea and the suspended Wes Brown, squandered a clear opening at the start of the second half and Steven Fletcher went close with a back-post header from Lee Cattermole's inviting cross.
This is a significant compromise, but with a clear opening concerning the issue of remarried divorcees.
Although the game opened up as a result of the dismissal, neither side was able to create a clear opening until the final minute of the game when Papastathopoulos found the net with a scuffed shot from inside the box after Navas had parried Gekas's shot into his path.
And Stoke were forced to settle for a slender lead once Whitehead's drilled effort was well blocked in their last clear opening of the match.
The first clear opening of the match came after 24 minutes when Byrne showed great determination to dispossess Ritchie Sutton before bearing down on goal.
The forward suffered a hamstring injury and his replacement, Caiuby, created the clearest opening of the first half when releasing Alexander Esswein behind the Liverpool defence.
