Kind of acid used in soap (5)

I believe the answer is:

oleic

'kind of acid used in soap' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for oleic that I've seen before include "Sort of acid" , "A fatty acid, -- acid" , "of a deposit?" .)

I've seen this clue in the Penny Press.

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