Language of Sikh merchant? (5)

I believe the answer is:

khmer

'language' is the definition.
(Khmer is an example)

'of sikh merchant?' is the wordplay.
'of' indicates a hidden word.
'KHMER' can be found hidden inside 'sikh merchant'.

(Other definitions for khmer that I've seen before include "Asian" , "'... Rouge, led by Pol Pot in Cambodia (5)'" , "Cambodian language" , "Language of Cambodia" , "Native Cambodian" .)

I've seen this clue in The Telegraph.

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