Quash urge for snack (6,3)
I believe the answer is:
scotch egg
'snack' is the definition.
(a Scotch egg might be eaten as a snack)
'quash urge' is the wordplay.
'quash' becomes 'scotch' (I've seen this before).
'urge' becomes 'egg' (as in egging someone on).
'scotch'+'egg'='SCOTCH EGG'
'for' acts as a link.
(Other definitions for scotch egg that I've seen before include "One cased in sausage meat" , "Savoury snack" , "Picnic food" , "Hard-boiled item in sausage meat" , "teatime fare?" .)