Weapon criminal girl brought in (6)
I believe the answer is:
cannon
'weapon' is the definition.
(I know that cannon is a type of ordnance)
'criminal girl brought in' is the wordplay.
'criminal' becomes 'con' (abbreviation for 'convict').
'girl' becomes 'ann' (woman's name).
'brought in' indicates putting letters inside.
'con' going around 'ann' is 'CANNON'.
(Other definitions for cannon that I've seen before include "Old naval gun" , "Heavy ordnance" , "Item of heavy artillery" , "The large gun sounds like a church dignitary" , "shot playing billiards" .)