Holding inside racket (3)
I believe the answer is:
din
'racket' is the definition.
(both can mean a loud noise or disturbance)
'holding inside' is the wordplay.
'inside' indicates the answer is hidden within the clue.
'DIN' is hidden in the letters of 'holding'.
(Other definitions for din that I've seen before include "A lot of unpleasant noise" , "Unwanted noise" , "'Continuous, unpleasant noise (3)'" , "Row, noise" , "Loud and long noise" .)