Singer caught by a wave (8)
I believe the answer is:
caroller
'singer' is the definition.
(I know that caroller is a type of singer)
'caught by a wave' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'by' is a charade indicator (letters next to each other).
'wave' becomes 'roller' (roller is a kind of wave).
'c'+'a'+'roller'='CAROLLER'
(Other definitions for caroller that I've seen before include "that makes Christmas music" , "Singer" .)