Look round at an exceptional leg? (4)
I believe the answer is:
ogle
'look' is the definition.
(I know that ogle is a more specific form of the action look)
'round at an exceptional leg?' is the wordplay.
'round' becomes 'o' (round can mean a round object).
'at' is a charade indicator (letters next to each other).
'an exceptional' indicates an anagram.
'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" .)