Flipping racket about very loud university outflow (8)
I believe the answer is:
effusion
'outflow' is the definition.
(thesaurus)
'flipping racket about very loud university' is the wordplay.
'flipping' says the letters should be written in reverse.
'racket' becomes 'noise' ('noise' can be a synonym of 'racket'**).
'about' indicates putting letters inside.
'very loud' becomes 'ff' (musical abbreviation).
'university' becomes 'u'.
'noise' reversed gives 'esion'.
'ff'+'u'='ffu'
'esion' enclosing 'ffu' is 'EFFUSION'.
(Other definitions for effusion that I've seen before include "Outburst" , "Gush" , "A streaming out" , "Piece of unrestrained writing" , "Unrestrained outpouring" .)