Listens out for volunteers (7)
I believe the answer is:
enlists
'for volunteers' is the definition.
(I've seen this before)
'listens out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'listens' anagrammed gives 'ENLISTS'.
(Other definitions for enlists that I've seen before include "volunteers" , "Joins up" , "Recruits" , "Registers" , "gets involved" .)