Combatants or boxers (8)
I believe the answer is:
fighters
'combatants or boxers' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for fighters that I've seen before include "Military aircraft" , "They struggle" , "Boxers or military planes" , "Combatants or boxers" , "Battlers, boxers" .)