Shopkeeper's rare tile broken (8)
I believe the answer is:
retailer
'shopkeeper's' is the definition.
(I've seen this in another clue)
'rare tile broken' 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 "Seller (of goods)" , "Seller to the public" , "Purveyor" , "Store-keeper" , "Tradesman" .)