Cut menu too drastically and you're on your own (5,2,3)

I believe the answer is:

count me out

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'you're on your own' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'cut menu too drastically' is the wordplay.
'drastically' is an anagram indicator.
'cut'+'menu'+'too'='cutmenutoo'
'cutmenutoo' anagrammed gives 'COUNT ME OUT'.

'and' is the link.

Can you help me to learn more?

I've seen this clue in The Daily Express.

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