Appeal of quiet meadow (4)
I believe the answer is:
plea
'appeal' is the definition.
(plea is a kind of appeal)
'quiet meadow' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano').
'meadow' becomes 'lea' (I've seen this before**).
'p'+'lea'='PLEA'
'of' acts as a link.
(Other definitions for plea that I've seen before include "Humble request for help" , "Earnest appeal" , "suit" , "Request - appeal" , "Answer made by the accused to the charge" .)