Is purple ensemble from this retailer? (8)
I believe the answer is:
supplier
'this retailer?' is the definition.
(thesaurus)
'is purple ensemble' is the wordplay.
'ensemble' indicates an anagram.
'is'+'purple'='ispurple'
'ispurple' anagrammed gives 'SUPPLIER'.
'from' acts as a link.
(Other definitions for supplier that I've seen before include "One who provides" , "Provider (of goods)" , "Provider of a product" , "Wholesaler, e.g." , "One providing something" .)