Nurture, cultivate (6)
I believe the answer is:
foster
This clue is a double definition.
'nurture' is the first definition.
(I know that foster is a kind of nurture)
'cultivate' is the second definition.
(thesaurus)
(Other definitions for foster that I've seen before include "Gloucester-bound doctor - nurse" , "Member of 7 [ORDER OF MERIT]" , "advance" , "doctor in shower" , "Promote, encourage" .)