Animal doctor I've trusted somewhat (3)
I believe the answer is:
vet
'animal doctor' is the definition.
(veterinarian)
'i've trusted somewhat' is the wordplay.
'somewhat' says the answer is hidden in the clue.
'VET' is hidden within 'ive trusted'.
(Other definitions for vet that I've seen before include "Examine carefully - might one help a lame duck?" , "solider once" , "'Animal doctor, in short (3)'" , "Check someone for suitability" , "Experienced" .)