Number of men in expensive clothes (4)
I believe the answer is:
nine
'number' is the definition.
(nine is a number)
'men in expensive clothes' is the wordplay.
'clothes' says the answer is hidden in the clue (the letters clothe the hidden word).
'NINE' is hidden in the letters of 'men in expensive'.
'of' acts as a link.
(Other definitions for nine that I've seen before include "A number of worthies" , "'Possession is... points of the law'" , "Short time for a wonder" , "A stitch in time saves them" , "Square next up after four" .)