Swarming troop carries Edward’s explosive projectile (7)
I believe the answer is:
torpedo
'explosive projectile' is the definition.
'swarming troop carries edward's' is the wordplay.
'swarming' indicates an anagram.
'carries' means one lot of letters goes inside another.
'edward' becomes 'ed'.
'troop' anagrammed gives 'torpo'.
'torpo' going around 'ed' is 'TORPEDO'.
(Other definitions for torpedo that I've seen before include "Self-propelled submarine weapon" , "Sea-borne missile" , "American sandwich made with a long split roll" , "fish you want" , "To wreck" .)