Type of acid (5)

I think it could be either:

Which length description are you looking for?:

oleic

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

This is all the clue.

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

I've seen this clue in The Times.

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