Small swelling (4)

I think it could be either:

Which length description are you looking for?:

nodule

'small swelling' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for nodule that I've seen before include "A small rounded lump" , "Small protuberance" , "Small round lump" , "Little round lump" , "Small knot" .)

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

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