Valuate (6)
I believe the answer is:
assess
'valuate' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for assess that I've seen before include "'Evaluate, appraise (6)'" , "Estimate the worth or quality of" , "Weigh up, estimate value" , "'Judge, estimate (6)'" , "Evaluate worth" .)