Shopkeeper's broken rare tile (8)
I believe the answer is:
retailer
'shopkeeper's' is the definition.
(thesaurus)
'broken rare tile' is the wordplay.
'broken' indicates an anagram.
'rare'+'tile'='raretile'
'raretile' with letters rearranged gives 'RETAILER'.
(Other definitions for retailer that I've seen before include "Merchant" , "teller" , "story-teller" , "Store-keeper" , "One selling to public" .)