Drink with Scotsman over in university grounds (6)
I believe the answer is:
campus
'university grounds' is the definition.
(I've seen this before)
'drink with scotsman over' is the wordplay.
'drink' becomes 'sup' (I've seen this before**).
'with' is a charade indicator (letters next to each other).
'scotsman' becomes 'mac'.
'over' shows that the letters should be reversed in order.
'sup'+'mac'='supmac'
'supmac' back-to-front is 'CAMPUS'.
'in' is the link.
(Other definitions for campus that I've seen before include "University location" , "College estate" , "University premises" , "university territory" , "University buildings and grounds" .)