Which person? (3)

I think it could be either:

Which length description are you looking for?:

who

'which person?' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for who that I've seen before include "Which people" , "international medical group" , "Question of identity" , "The - - , rock legends" , "medical experts" .)

I've seen this clue in The Independent, the USA Today, The Telegraph, the Newsday, The Star Tribune, The Times, the Penny Press and the King Feature Syndicate.

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