Damage shower? Carpeting (not new) ruined (5,3)
I believe the answer is:
price tag
'damage shower?' is the definition.
(I've seen this before)
'carpeting not new ruined' is the wordplay.
'not' is a deletion indicator.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'ruined' indicates an anagram.
'carpeting' with 'n' taken out is 'carpetig'.
'carpetig' is an anagram of 'PRICE TAG'.
(Other definitions for price tag that I've seen before include "Indication of cost" , "damage shower" , "Label indicating cost" , "Shop goods label" , "shows outlay required" .)