Got a new nanny? (4)
I believe the answer is:
goat
'nanny?' is the definition.
(nanny is a female goat)
'got a new' is the wordplay.
'new' is an anagram indicator.
'got'+'a'='gota'
'gota' with letters rearranged gives 'GOAT'.
(Other definitions for goat that I've seen before include "heavenly sign" , "Butting nanny, perhaps?" , "foolish person" , "Horned beast" , "Capricorn animal" .)