Weapons diced vegetable (4,3)
I believe the answer is:
snow pea
'vegetable' is the definition.
(snow pea is a kind of vegetable)
'weapons diced' is the wordplay.
'diced' is an anagram indicator.
'weapons' is an anagram of 'SNOW PEA'.
(Other definitions for snow pea that I've seen before include "Mangetout (US)" , "pulse" , "American plant" .)