Go quietly and look (4)
I believe the answer is:
peep
'look' is the definition.
(peep is a kind of look)
'go quietly' is the wordplay.
'go' becomes 'pee' (both can mean to urinate**).
'quietly' becomes 'p' (p for piano and quiet).
'pee'+'p'='PEEP'
'and' is the link.
(Other definitions for peep that I've seen before include "Palindromic glimpse" , "Look surreptitiously, like Tom" , "Chirp" , "Look furtively or voyeuristically" , "Secret look" .)