Bears new sword (5)
I believe the answer is:
sabre
'sword' is the definition.
(I know that sabre is a type of sword)
'bears new' is the wordplay.
'new' indicates anagramming the letters.
'bears' is an anagram of 'SABRE'.
(Other definitions for sabre that I've seen before include "Bares (anag.)" , "Heavy cavalry sword" , "Walt --, cartoonist" , "Type of sword" , "Large wasp" .)