Young person carrying weapon in town ... (8)
I believe the answer is:
yarmouth
'town' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?
'young person carrying weapon' is the wordplay.
'young person' becomes 'youth' ('youth' can be a synonym of 'young person').
'carrying' means one lot of letters goes inside another.
'weapon' becomes 'arm' (I've seen this before).
'youth' going around 'arm' is 'YARMOUTH'.
'in' is the link.
Can you help me to learn more?
(Other definitions for yarmouth that I've seen before include "27 [ISLAND] town" , "Peggotty's port (Norfolk)" , "Isle of Wight town (Great in Norfolk)" , "IOW resort" , "Norfolk resort" .)