The most common and most likely answer to this crossword clue is the 5 plus 4 letter word NANNY GOAT
I've seen this crossword clue in The Times
N
A
N
N
Y
G
O
A
T
More clues leading to the result NANNY GOAT
- Got any bananas to go with bread and butter?
- Over-protective, vigorously criticise butter
- Spoil piece about old Billy's mate
- Governess has shot at making butter, possibly
- Billy's mate, the one looking after the kids?
- The desire of Billy No-Mates?
- . Good old Grandma’s first with a top tip for mother of kids
- Billy’s mum tango dancing round an empty nunnery
- Childcare provider learnt to accept charge’s third animal
- . Child-minder to attack farm animal
Buddy explains!

The straight part
We know that "butter" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case butter = nanny goat.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
Crossword Answer definitions
NANNY GOAT noun- A female goat.