Crossword Genius

Simple decision that’s up for review (15)

Ross

I believe the answer is:

unsophisticated

'simple' is the definition.
(I've seen this before)

'decision that's up for review' is the wordplay.
'for review' is an anagram indicator.
'decision'+'thats'+'up'='decisionthatsup'
'decisionthatsup' is an anagram of 'UNSOPHISTICATED'.

(Other definitions for unsophisticated that I've seen before include "straightforward" , "Simple" , "green" , "Lacking experience" , "crude" .)

I've seen this clue in The Times.
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