'Mid (5)

I think it could be either:

Which length description are you looking for?:

central

'mid' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for central that I've seen before include "Middle; crucial" , "Near the middle" , "Focal" , "Most important, principal" , "Key" .)

I've seen this clue in the Evening Standard and the Penny Press.

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