Scrutinize (4)
I believe the answer is:
scan
'scrutinize' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for scan that I've seen before include "Examine intensely -- examine superficially" , "Survey - fit in metrically" , "Read electronically" , "Glance at quickly rather than thoroughly" , "Browse or skin over, say book" .)