Look for a very quiet listener (6)
I believe the answer is:
appear
'look' is the definition.
('appear' can be a synonym of 'look')
'a very quiet listener' is the wordplay.
'very quiet' becomes 'pp'.
'listener' becomes 'ear' (I've seen this before).
'a'+'pp'+'ear'='APPEAR'
'for' acts as a link.
(Other definitions for appear that I've seen before include "hove in sight" , "Seem or materialise" , "Turn up" , "Make an entrance as ghost may" , "Look - materialise" .)