Bark in court, loudly (4)
I believe the answer is:
woof
'bark' is the definition.
(I know that bark can be written as woof)
'court loudly' is the wordplay.
'court' becomes 'woo' (both can mean to romance someone).
'loudly' becomes 'f' (short for forte - 'loud' in music).
'woo'+'f'='WOOF'
'in' is the link.
(Other definitions for woof that I've seen before include "Sound of bark - weft" , "Sound of dog's bark" , "Cry of dog - texture of fabric" , "Texture of fabric - bark" , "The thread" .)