Container in mind for rifle (7)
I believe the answer is:
'for rifle' is the definition.
(carbine is a kind of rifle)
'container in mind' is the wordplay.
'container' becomes 'bin' (bin is a type of container).
'in' indicates putting letters inside.
'mind' becomes 'care' (I've seen this before).
'bin' put inside 'care' is 'CARBINE'.
(Other definitions for carbine that I've seen before include "A short light automatic rifle" , "Light automatic rifle -- nice bra (anag)" .)