Girl cuddling rascal on ecstasy in university (7)
I believe the answer is:
academy
'university' is the definition.
(I've seen this before)
'girl cuddling rascal on ecstasy' is the wordplay.
'girl' becomes 'amy'.
'cuddling' means one lot of letters goes inside another.
'rascal' becomes 'cad' (I've seen this in another clue).
'on' means one lot of letters go next to another.
'ecstasy' becomes 'E' (informal term for the drug).
'cad'+'e'='cade'
'amy' going around 'cade' is 'ACADEMY'.
'in' is the link.
(Other definitions for academy that I've seen before include "Educational institution" , "Centre of learning" , "Place of specialised study or training" , "Establishment for the advancement of knowledge" , "training centre" .)