Mention in passing (6)

I think it could be either:

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5,2

allude

'mention in passing' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for allude that I've seen before include "Mention; imply" , "Make reference to in passing" , "Suggest or call attention to indirectly" , "Speak about in passing" , "Refer to, speak of" .)

I've seen this clue in The Irish Times.

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