Possibly bears a sword (5)
I believe the answer is:
sabre
'a sword' is the definition.
(I know that sabre is a type of sword)
'possibly bears' is the wordplay.
'possibly' indicates an anagram.
'bears' is an anagram of 'SABRE'.
(Other definitions for sabre that I've seen before include "Walt --, cartoonist" , "Type of sword" , "Sword with curved blade" , "Bares (anag.)" , "Heavy cavalry sword" .)