Captive colonel, in error, makes a witty remark (8)

I believe the answer is:

oneliner

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'a witty remark' is the definition.
(I've seen this before)

'captive colonel in error' is the wordplay.
'ONELINER' is hidden within the letters.
However, I'm unsure how this is indicated.

'makes' acts as a link.

Can you help me to learn more?

(Another definition for oneliner that I've seen is " Witty remark".)

I've seen this clue in The Irish Times.

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