Comrades both injured, unable to fight (4,2,6)
I believe the answer is:
hors de combat
'unable to fight' is the definition.
I can't judge whether this definition defines the answer.
'comrades both injured' is the wordplay.
'injured' is an anagram indicator.
'comrades'+'both'='comradesboth'
'comradesboth' with letters rearranged gives 'HORS DE COMBAT'.
Can you help me to learn more?
(Other definitions for hors de combat that I've seen before include "Injured and out of action (French)" , "Disabled, out of the fight" , "Out of action due to injury" .)