Look, part of leg limps excessively (7)
I believe the answer is:
glimpse
'look' is the definition.
(glimpse is a kind of look)
'part of leg limps excessively' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'GLIMPSE' is hidden within 'leg limps excessively'.
(Other definitions for glimpse that I've seen before include "Gander" , "Momentary view (of something)" , "spot" , "Brief look" , "A quick look" .)