Quickly dismiss pin, in error (7,3)
I believe the answer is:
skittle out
'quickly dismiss' is the definition.
(I've seen this before)
'pin in error' is the wordplay.
'pin' becomes 'skittle' (skittle is a kind of pin).
'in error' becomes 'out' (I've seen this before).
'skittle'+'out'='SKITTLE OUT'
(Other definitions for skittle out that I've seen before include "Quickly dismiss" , "Remove as if bowling a ball" .)