Nurse for a goat (5)
I believe the answer is:
nanny
This clue is a double definition.
'nurse' is the first definition.
(I know that nurse can be written as nanny)
'goat' is the second definition.
(I know that nanny is a type of goat)
'for a' acts as a link.
(Other definitions for nanny that I've seen before include "Issue tender" , "cares for child?" , "eg Mary Poppins" , "Posh child minder or female goat" , "Child minder - goat - grandma" .)