Nice quiet meadows associated with worker (8)
I believe the answer is:
pleasant
'nice' is the definition.
(similar in meaning)
'quiet meadows associated with worker' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'meadows' becomes 'leas' (lea can mean a meadow or field).
'associated with' is a charade indicator (letters next to each other).
'worker' becomes 'ant' (worker is a type of ant).
'p'+'leas'+'ant'='PLEASANT'
(Other definitions for pleasant that I've seen before include "Delightful" , "Satisfying, likeable" , "Enjoyable, agreeable" , "Attractive" , "sweet?" .)