Whelp (3)

I think it could be either:

Which length description are you looking for?:

pup

'whelp' is the definition.
(synonyms)

This is all the clue.

(Other definitions for pup that I've seen before include "Small palindromic dog" , "Youngster" , "Young seal" , "Young dog as palindrome" , "Produce litter" .)

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

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