Arm (5)
'arm' is the definition.
(I know that arm can be written as weapon)
This is the entire clue.
(Other definitions for weapon that I've seen before include "Feel a great desire for" , "Thing used in conflict, gun or knife" , "Means of offensive action" , "Instrument of attack or defence" , "Gun, say?" .)
'arm' is the definition.
(arm can mean to equip or supply)
This is all the clue.
(Other definitions for equip that I've seen before include "Provide with requirements" , "Fit out, supply" , "Arm" , "Supply (with items)" , "Furnish, fit out" .)