Dances in series repeated never popular with Charles (3-3-4)

I believe the answer is:

cha-cha-chas

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

'dances' is the definition.
(cha-cha-cha is a kind of dance)

'series repeated never popular with charles' is the wordplay.
I cannot quite see how this works, but
'charles' could be 'chas' (shortened form) and 'chas' is found within the answer.
The remaining letters 'chacha' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'in' is the link.

Can you help me to learn more?

I've seen this clue in The Independent.

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