Leave time to get a nanny (4)
I believe the answer is:
goat
'nanny' is the definition.
(nanny is a female goat)
'leave time to get a' is the wordplay.
'leave' becomes 'go' (to go is to depart or leave).
'time' becomes 't' (abbreviation).
'to get' means one lot of letters go next to another.
't' put after 'a' is 'at'.
'go'+'at'='GOAT'
(Other definitions for goat that I've seen before include "fool" , "Animal in zodiac" , "Horned beast" , "lecherous sort" , "nanny, for example" .)