Crossword Genius

Still worked up about large student set (5)

Ross

I believe the answer is:

telly

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'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" .)

I've seen this clue in The Telegraph.
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