Kind of oil (6)

I think it could be either:

Which length description are you looking for?:

linseed

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

This is all the clue.

(Other definitions for linseed that I've seen before include "Oil produced from flax" , "Source of plant oil" , "Oil applied to cricket bats" , "Treatment for bats" , "Flax product, a source of oil" .)

I've seen this clue in the Penny Press.

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