Promote the development of (6)
I believe the answer is:
foster
'promote the development of' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for foster that I've seen before include "Gloucester-bound doctor - nurse" , "Promote, encourage" , "Help to develop and grow" , "Old woodman" , "Promote growth and development of, say child" .)