Connolly, try a bit of toast and butter (5,4)

I believe the answer is:

billy goat

'butter' is the definition.
(animal which butts)

'connolly try a bit of toast' is the wordplay.
'connolly' becomes 'Billy' (comedian Billy Connolly).
'try' becomes 'go' (both can mean an attempt).
'bit of' suggests taking the first letters.
The first letter of 'toast' is 't'.
'billy'+'go'+'a'+'t'='BILLY-GOAT'

'and' acts as a link.

I've seen this clue in The Guardian.

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