The worker asking for clarification may be protecting you from an expensive assumption.

Questions cost minutes; assumptions cost weeks. Someone stopping to check what you meant is doing the expensive part early, while the work can still be redirected, and their reluctance to look uncertain is usually the only thing in the way. Discourage the asking, even mildly, and you will get confident work aimed at the wrong target.

When someone asks you to clarify, answer as though they did you a favor, because they did. Say thanks for the question, then give the specifics. If nobody ever asks you anything, treat that as a warning rather than a sign of clarity.