Uppermost

I think it could be either:

Which length description are you looking for?:

top

'uppermost' is the definition.
(similar in meaning)

This is the entire clue.

(Other definitions for top that I've seen before include "Children's toy" , "Most successful" , "Kill" , "The circus tent can be a big one" , "Pinnacle" .)

I've seen this clue in The Sunday Times and The Times.

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