‘e called after blast, returning weapon (9)
I believe the answer is:
boomerang
'returning weapon' is the definition.
(weapon which returns when thrown)
''e called after blast' is the wordplay.
'called' becomes 'rang' (called on the phone).
'after' says to put letters next to each other.
'blast' becomes 'boom' (synonyms).
'e'+'rang'='erang'
'erang' after 'boom' is 'BOOMERANG'.
(Other definitions for boomerang that I've seen before include "Curved throwing stick" , "Primitive weapon" , ""It keeps coming back"" , "Self-returning missile" , "Backfire" .)