Appraise; size up
I believe the answer is:
evaluate
This clue is a double definition.
'appraise' is the first definition.
(I know that appraise can be written as evaluate)
'size up' is the second definition.
(I've seen this in another clue)
(Other definitions for evaluate that I've seen before include "Make an assessment of, measure" , "Reckon worth of" , "Judge the worth of something" , "Make an assessment of, determine worth" , "'Assess, appraise (8)'" .)