Sign of damage? (5,3)
I believe the answer is:
price tag
I believe this clue is a double definition.
'sign' is the first definition.
(price tag is a kind of sign)
'damage?' is the second definition.
(thesaurus)
'of' is the link.
(Other definitions for price tag that I've seen before include "damage shower" , "Indication of cost" , "shows outlay required" , "This shows what it should cost" , "What a ticket may show" .)