Fix a quiet spot (7)
I believe the answer is:
appoint
'fix' is the definition.
(I've seen this before)
'a quiet spot' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'spot' becomes 'point' (synonyms).
'a'+'p'+'point'='APPOINT'
(Other definitions for appoint that I've seen before include "Determine (a time/place)" , "Delegate" , "Put into a post" , "get the post sorted" , "Assign position to" .)