Underlying (6)

I think it could be either:

Which length description are you looking for?:

latent

'underlying' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for latent that I've seen before include "Hidden, dormant" , "Inactive - potential" , "Existing but hidden" , "Not presently active" , "Not (yet) apparent" .)

I've seen this clue in The Mirror.

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