Hardly a secret ingredient? (6)

I believe the answer is:

garlic

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'ingredient?' is the definition.
(I know that garlic is a type of seasoning)

I can't explain the rest of the clue.

(Other definitions for garlic that I've seen before include "Bulb used in cooking" , "Aromatic bulb used as seasoning" , "Bulb used in cookery" , "Pungent bulbs" , "Flavouring bulb" .)

I've seen this clue in the Evening Standard.

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