Loud argument covering a right to create litter (6)
I believe the answer is:
farrow
'litter' is the definition.
(farrowing is a kind of littering)
'loud argument covering a right' is the wordplay.
'loud' becomes 'f' (A musical term).
'argument' becomes 'row' (I've seen this before).
'covering' indicates putting letters inside.
'a right' becomes 'ar' (I've seen this in other clues**).
'f'+'row'='frow'
'frow' enclosing 'ar' is 'FARROW'.
'to create' is the link.
(Other definitions for farrow that I've seen before include "Actress" , "Give birth to piglets" , "Produce piglets" , "Little piggies" , "Litter - very much on bank?" .)