... as ten copy out To Change the Beat (9)

I believe the answer is:

syncopate

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

'ito change the beati' is the definition.
I can't tell whether this definition defines the answer.

'as ten copy out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'as'+'ten'+'copy'='astencopy'
'astencopy' with letters rearranged gives 'SYNCOPATE'.

Can you help me to learn more?

(Another definition for syncopate that I've seen is " Displace musical beats".)

I've seen this clue in the Sydney Morning Herald.

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