Gun-toting adolescent in resort (8)
I believe the answer is:
yarmouth
'resort' is the definition.
(I've seen this before)
'gun-toting adolescent in' is the wordplay.
'gun-toting' becomes 'arm' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'adolescent' becomes 'youth' (I've seen this before).
'in' is an insertion indicator.
'arm' inserted into 'youth' is 'YARMOUTH'.
Can you help me to learn more?
(Other definitions for yarmouth that I've seen before include "IOW resort" , "Peggotty's port (Norfolk)" , "holiday resort" , "27 [ISLAND] town" , "Norfolk resort" .)