Cambodian customer? (3)

I believe the answer is:

bod

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'customer?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'cambodian' is the wordplay.
'BOD' is hidden within the letters.
But, I'm not sure how the hidden word is indicated.

Can you help me to learn more?

(Another definition for bod that I've seen is " Bloke".)

I've seen this clue in the Evening Standard.

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