Trade turnover assessed (5)
I believe the answer is:
rated
'assessed' is the definition.
(rating is a kind of assessing)
'trade turnover' is the wordplay.
'turnover' is an anagram indicator.
'trade' with letters rearranged gives 'RATED'.
(Other definitions for rated that I've seen before include "Estimated the value or assigned a ranking" , "Graded, ranked" , "Tread (anag.)" , "Taxed" , "Censured" .)