Mess about in compliance review (10)
I believe the answer is:
assessment
'review' is the definition.
(I've seen this before)
'mess about in compliance' is the wordplay.
'about' indicates anagramming the letters.
'in' means one lot of letters goes inside another.
'compliance' becomes 'assent' (I've seen this before).
'mess' with letters rearranged gives 'ssme'.
'ssme' inserted into 'assent' is 'ASSESSMENT'.
(Other definitions for assessment that I've seen before include "rating" , "Opinion" , "Process of valuation" , "test" , "Examination" .)