Animal doctor providing check (3)
I believe the answer is:
vet
This clue is a double definition.
'animal doctor' is the first definition.
(veterinarian)
'check' is the second definition.
(to vet someone is to check their background)
'providing' acts as a link.
(Other definitions for vet that I've seen before include "Dog doc?" , "Examine carefully - might one help a lame duck?" , "animal doctor to > investigate" , "A diminutive animal doctor" , "Examine carefully for suitability" .)