Official language of Cambodia (5)
I believe the answer is:
khmer
'official language of cambodia' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for khmer that I've seen before include "Cambodian language" , "Asian" , "Language of Cambodia" , "'... Rouge, led by Pol Pot in Cambodia (5)'" , "Native Cambodian" .)