Look round at an exceptional leg? (4)
I believe the answer is:
ogle
'look' is the definition.
(I know that ogle has the is a more specific form of the action look)
'round at an exceptional leg?' is the wordplay.
'round' becomes 'o' (o is a circular letter).
'at' says to put letters next to each other.
'an exceptional' is an anagram indicator (an unusual or exceptional ordering of the letters).
'leg' with letters rearranged gives 'gle'.
'o'+'gle'='OGLE'
(Other definitions for ogle that I've seen before include "lewd look" , "Look with desire" , "Eye greedily" , "Make eyes at" , "Look at amorously" .)