Mythological beast in Antler Club misbehaving (6,4)

I believe the answer is:

cretan bull

I'm a little stuck... Click here to teach me more about this clue!

'mythological beast' is the definition.
'cretan bull' can be an answer for 'beast' (I have seen 'Mythical beast' mean 'cretan bull' so perhaps 'beast' could also mean 'cretan bull'). I am unsure of the 'mythological' bit.

'antler club misbehaving' is the wordplay.
'misbehaving' is an anagram indicator.
'antler'+'club'='antlerclub'
'antlerclub' anagrammed gives 'CRETAN BULL'.

'in' is the link.

Can you help me to learn more?

(Another definition for cretan bull that I've seen is " Mythical beast".)

I've seen this clue in The Telegraph.

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