Can it sell out and cease trading? (4,2,4)
I believe the answer is:
shut up shop
'cease trading?' is the definition.
(I've seen this before)
'can it sell out' is the wordplay.
'can it' becomes 'shut up' (I've seen this before).
'sell out' becomes 'shop' (I've seen this before).
'shutup'+'shop'='SHUT UP SHOP'
'and' acts as a link.
(Other definitions for shut up shop that I've seen before include "Cease trading" , "Close business at end of day (or permanently)" .)