Love spiciness added to recipe by the way (6)

I believe the answer is:

obiter

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'by the way' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for obiter that I've seen before include "incidentally" , "In passing" , "Incidental remark in Latin - . . . . . . dictum" , "By the way (Latin)" , "..... dictum means any incidental remark" .)

I've seen this clue in The Sunday Times and The Times.

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