Compliment quiet lift (6)
I believe the answer is:
praise
'compliment' is the definition.
(thesaurus)
'quiet lift' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano').
'lift' becomes 'raise' ('raise' can be a synonym of 'lift').
'p'+'raise'='PRAISE'
(Other definitions for praise that I've seen before include "Approve and commend" , "Applaud, commend" , "Extol, laud" , "Congratulate" , "Acclaim, commend" .)