Change ensured for consumer (3,4)
I believe the answer is:
end user
'for consumer' is the definition.
(end user is a kind of consumer)
'change ensured' is the wordplay.
'change' is an anagram indicator.
'ensured' anagrammed gives 'END-USER'.
(Other definitions for end user that I've seen before include "One showing ultimate possession" , "Being last to receive goods" , "Person for whom a product is destined" , "One who finally receives a product" , "not interested in the beginning?" .)