By the way (12)

I think it could be either:

Which length description are you looking for?:

2,7

in passing

'by the way' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for in passing that I've seen before include "Where footballer may show skill" , "casually" , "by the way" .)

I've seen this clue in The Mirror.

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