Student in mad uproar in sitting-room (7)
I believe the answer is:
parlour
'sitting-room' is the definition.
(I've seen this before)
'student in mad uproar' is the wordplay.
'student' becomes 'l' (as in L-plates for learner drivers).
'in' is an insertion indicator.
'mad' is an anagram indicator.
'uproar' with letters rearranged gives 'parour'.
'l' placed into 'parour' is 'PARLOUR'.
'in' is the link.
(Other definitions for parlour that I've seen before include "Room in public house" , "Living room - where farmers milk cows?" , "Room for receiving guests in a monastery" , "'Lounge, sitting-room (7)'" , "Old-fashioned living room" .)