Guaranteed end-user review (7)
I believe the answer is:
ensured
'guaranteed' is the definition.
('ensure' can be a synonym of 'guarantee')
'end-user review' is the wordplay.
'review' is an anagram indicator.
'end'+'user'='enduser'
'enduser' is an anagram of 'ENSURED'.
(Other definitions for ensured that I've seen before include "guaranteed" , "Make certain of" , "Determined" , "Made certain for end user" , "Made certain, clinched" .)