Some claim men seem unusually large (7)
I believe the answer is:
immense
'large' is the definition.
(similar in meaning)
'some claim men seem unusually' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'IMMENSE' is hidden in the letters of 'claim men seem unusually'.
(Other definitions for immense that I've seen before include "'Gigantic, extensive (7)'" , "Unusually great in size" , "Very big, really huge" , "Huge, vast" , "Exceedingly large" .)