One involved in argument over carpeting (5)
I believe the answer is:
tapis
'carpeting' is the definition.
(I've seen this before)
'one involved in argument over' is the wordplay.
'one' becomes 'i' (Roman numeral).
'involved in' indicates putting letters inside.
'argument' becomes 'spat' (a spat is a disagreement or argument).
'over' says the letters should be written in reverse.
'i' put into 'spat' is 'sipat'.
'sipat' reversed gives 'TAPIS'.
(Other definitions for tapis that I've seen before include "Carpeting" , "Covering" .)