Judge, estimate (6)
I believe the answer is:
assess
I believe this is a double definition.
'judge' is the first definition.
(to assess is to judge or rate)
'estimate' is the second definition.
(I've seen this before)
(Other definitions for assess that I've seen before include "Estimate the worth or quality of" , "Appraise, estimate value" , "Put a value on" , "Judge the quality of" , "Weigh up, estimate value" .)