Reached ones zenith when annoyed, we hear (6)
I believe the answer is:
peaked
'reached' is the definition.
(peaking is a kind of reaching)
'ones zenith when annoyed we hear' is the wordplay.
I cannot really understand how this works, but
'zenith' could be 'peak' (I've seen this in another clue) and 'peak' is located in the answer.
'when' could be 'e' (I've seen this in other clues) and 'e' is found within the answer.
A single letter 'd' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for peaked that I've seen before include "Reached one's greatest capacity" , "Reached highest point, say of fitness" , "Culminated" , "Reached highest degree in fitness" , "Reached maximum intensity" .)