Listen out for quiet (6)
I believe the answer is:
silent
'quiet' is the definition.
('silent' can be similar in meaning to 'quiet')
'listen out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'listen' with letters rearranged gives 'SILENT'.
'for' acts as a link.
(Other definitions for silent that I've seen before include "Without sound" , "Utterly quiet" , "Like early films" , "Enlist (anag) - mum" , "the moderate majority?" .)