Soap ingredient

I think it could be either:

Which length description are you looking for?:

tallow

'soap ingredient' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for tallow that I've seen before include "Contributor to soap" , "Animal fat used in making soap" , "Melted, clarified animal fat" , "Soap ingredient" , "burning fat" .)

I've seen this clue in The New York Times and the Evening Standard.

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