Check some of those expenses! (3)
I believe the answer is:
see
'check' is the definition.
('see' can be a synonym of 'check')
'some of those expenses' is the wordplay.
'some of' indicates the answer is hidden within the clue.
'SEE' can be found hidden inside 'those expenses'.
(Other definitions for see that I've seen before include "Perceive, watch" , "Observe the bishop's domain" , "Observe a bishopric" , "View; prelacy" , "ecclesiastical division" .)