Performing with an academic continuously (2,3,2)
I believe the answer is:
on and on
'continuously' is the definition.
(I've seen this before)
'performing with an academic' is the wordplay.
'performing' becomes 'on' (as in being on stage).
'with' is a charade indicator (letters next to each other).
'academic' becomes 'don' (type of academic - especially at Oxbridge).
'on'+'an'+'don'='ON AND ON'
(Other definitions for on and on that I've seen before include "continuously" , "Incessantly" , "Endlessly" , "Unceasingly" , "Ever" .)