Couple in Herat wounded (3)
I believe the answer is:
two
'couple' is the definition.
(a couple can mean two of something)
'in herat wounded' is the wordplay.
'in' indicates the answer is hidden within the clue.
'TWO' is hidden in the letters of 'herat wounded'.
(Other definitions for two that I've seen before include "A low number" , "'It takes ? to tango'" , "1 + 1" , "Company, so it's said" , "Between one and three" .)