Beat in court, briefly causing outcry (7)
I believe the answer is:
clamour
'outcry' is the definition.
(I know that clamour is a type of outcry)
'beat in court briefly' is the wordplay.
'beat' becomes 'lam' (I've seen this before).
'in' indicates putting letters inside.
'briefly' means to remove the last letter.
'court' with its final letter taken away is 'cour'.
'lam' placed within 'cour' is 'CLAMOUR'.
'causing' acts as a link.
(Other definitions for clamour that I've seen before include "racket" , "Loud and persistent outcry" , "Uproar" , "Loud confused noise" , "Hue and cry" .)