Check out surgeon (3)
I believe the answer is:
vet
I believe this is a double definition.
'check out' is the first definition.
(to vet is to perform checks)
'surgeon' is the second definition.
(veterinary surgeon)
(Other definitions for vet that I've seen before include "Examine carefully - might one help a lame duck?" , "Scrutinise" , "animal doctor to > investigate" , "Examine, check" , "Examine carefully for suitability" .)