Quiet moment for routine (6)
I believe the answer is:
shtick
'routine' is the definition.
(I've seen this before)
'quiet moment' is the wordplay.
'quiet' becomes 'sh'.
'moment' becomes 'tick' (I've seen this before).
'sh'+'tick'='SHTICK'
'for' acts as a link.
(Other definitions for shtick that I've seen before include "comedy routine" , "comic's routine" , "funny routine" , "Comedian's routine - kitsch (anag)" , "Performer's routine" .)