Nurse, nurture (6)
I believe the answer is:
suckle
I believe this is a double definition.
'nurse' is the first definition.
(I know that nurse can be written as suckle)
'nurture' is the second definition.
(I've seen this before)
(Other definitions for suckle that I've seen before include "Feed (baby) from breast" , "Breastfeed" , "Nurse" , "Nurture" , "Feed from a teat" .)