Still worked up about large student set (5)
I believe the answer is:
telly
'set' is the definition.
(telly is a kind of set)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for telly that I've seen before include "Familiar name for TV" , "Set" , "The goggle-box" , "'The box' (colloquial)" , "- - Savalas" .)