Attacker with a right to an assistant? (6)
I believe the answer is:
raider
'attacker' is the definition.
(I've seen this in another clue)
'with a right to an assistant?' is the wordplay.
'with' means one lot of letters go next to another.
'a right' becomes 'r' (common abbreviation).
'to an assistant?' becomes 'aider' (I've seen this in another clue).
'r' put next to 'aider' is 'RAIDER'.
(Other definitions for raider that I've seen before include "One plundering" , "One who makes surprise attack, perhaps to steal" , "Depredator" , "One attacks" , "Viking" .)