Equip with new weapons (5)
I believe the answer is:
rearm
'equip with new weapons' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for rearm that I've seen before include "Equip with new or better weapons" , "prepare for another war" , "Provide new weaponry" , "Provide with a new supply of weapons" , "Provide with fresh weapons" .)