Sight of exotic legs enthrals rascal (7)
I believe the answer is:
glimpse
'sight' is the definition.
(I have seen 'Brief sight ' mean 'glimpse' so perhaps 'sight' could also mean 'glimpse')
'exotic legs enthrals rascal' is the wordplay.
'exotic' indicates anagramming the letters.
'enthrals' means one lot of letters goes inside another.
'rascal' becomes 'imp' (synonyms).
'legs' with letters rearranged gives 'glse'.
'glse' going around 'imp' is 'GLIMPSE'.
'of' is the link.
(Other definitions for glimpse that I've seen before include "Notice" , "Momentary sighting" , "Gander" , "Fleeting vision" , "Glance, catch sight of" .)