Change nurses developing entire type of medicine (10)
I believe the answer is:
veterinary
'type of medicine' is the definition.
'change nurses developing entire' is the wordplay.
'change' becomes 'vary' ('vary' can be a synonym of 'change').
'nurses' indicates putting letters inside.
'developing' is an anagram indicator.
'entire' anagrammed gives 'eterin'.
'vary' going around 'eterin' is 'VETERINARY'.
(Other definitions for veterinary that I've seen before include "Animal doctor" , "Like some surgeons" .)