Endures spoiled customer (3,4)
I believe the answer is:
end user
'customer' is the definition.
(I've seen this before)
'endures spoiled' is the wordplay.
'spoiled' indicates an anagram.
'endures' anagrammed gives 'END-USER'.
(Other definitions for end user that I've seen before include "Person for whom a product is destined" , "client" , "Recipient of product sold" , "Final consumer" , "One getting the ultimate enjoyment" .)