Practical jokes from quiet rows (6)
I believe the answer is:
pranks
'practical jokes' is the definition.
(I've seen this in another clue)
'quiet rows' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'rows' becomes 'ranks' (I've seen this in another clue).
'p'+'ranks'='PRANKS'
'from' acts as a link.
(Other definitions for pranks that I've seen before include "Tricky things to play" , "Jokes, capers" , "Tricks" , "Practical jokes, pieces of mischief" .)