Working to bring back musical about college (6)
I believe the answer is:
active
'working' is the definition.
(similar in meaning)
'back musical about college' is the wordplay.
'back' says the letters should be written in reverse.
'musical' becomes 'evita' (Andrew Lloyd Webber musical).
'about' means one lot of letters goes inside another.
'college' becomes 'c'.
'evita' going around 'c' is 'evitca'.
'evitca' back-to-front is 'ACTIVE'.
'to bring' is the link.
(Other definitions for active that I've seen before include "Mobile" , "Keeping busy or operative" , "Dynamic, functioning" , "Lively, working away" , "Industrious" .)