Worry about place to dispose of gun (7)
I believe the answer is:
carbine
'gun' is the definition.
(I know that carbine is a type of Rifle)
'worry about place to dispose of' is the wordplay.
I cannot really understand how this works, but
'about' could be 'ca' (short for circa) and 'ca' is found within the answer.
'dispose of' could be 'bin' and 'bin' is located in the answer.
The remaining letters 're' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for carbine that I've seen before include "A short light automatic rifle" , "Light automatic rifle -- nice bra (anag)" .)