Launch snack? Unacceptable (4,3)
I believe the answer is:
roll out
'launch' is the definition.
(I have seen 'Public launch' mean 'roll out' so perhaps 'launch' could also mean 'roll out')
'snack? unacceptable' is the wordplay.
'snack?' becomes 'roll' (I can't explain this - if you can you should give a lot more credence to this answer).
'unacceptable' becomes 'out' (I've seen this before).
'roll'+'out'='ROLL-OUT'
Can you help me to learn more?
(Other definitions for roll out that I've seen before include "launch of new stock" , "Public launch" , "First appearance" .)