15 across
Weapon,
for
instance,
deployed
in
unending
attack
(7)
Weapon, for instance, deployed in unending attack (7)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
Right, so Weapon is what we're defining — an assegai's a type of spear. For the wordplay, take ASSAIL meaning attack, and dock the last letter since it's "unending", leaving you with ASSAI. Then drop EG (that's your "for instance") inside it, "deployed in" telling you it goes inside, and you're left with ASS-EG-AI.