Caught on what's left of the peak (5)
I believe the answer is:
crest
'the peak' is the definition.
(both can mean the top of something)
'caught on what's left' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'what's left' becomes 'rest' (I've seen this in other clues).
'c'+'rest'='CREST'
'of' is the link.
(Other definitions for crest that I've seen before include "Plume on a helmet" , "Top of a ridge/wave" , "Badge" , "Surmount" , "Head" .)