Stop, then encourage, a snack (6,3)
I believe the answer is:
scotch egg
'a snack' is the definition.
(a Scotch egg might be eaten as a snack)
'stop then encourage' is the wordplay.
'stop' becomes 'scotch' (I've seen this before).
'then' means one lot of letters go next to another.
'encourage' becomes 'egg'.
'scotch'+'egg'='SCOTCH EGG'
(Other definitions for scotch egg that I've seen before include "Savoury snack" , "teatime fare?" , "Hard-boiled item in sausage meat" , "Picnic food" , "It is encased in sausage meat" .)