Add spices in due time (6)

I believe the answer is:

season

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'time' is the definition.
(a season is a period of time)

I can't explain the rest of the clue.

(Other definitions for season that I've seen before include "' - - of mists ...' (Keats)" , "Spring, say" , "To dry (wood) for use as timber" , "Major division of year characterised by weather and growth" , "Add flavouring" .)

I've seen this clue in The Guardian.

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