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Rap and disco dancing now and then (8)

Ross

I believe the answer is:

sporadic

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'now and then' is the definition.
I can't judge whether this defines the answer.

'rap and disco dancing' is the wordplay.
'and' means one lot of letters go next to another (I've seen this in other clues).
'dancing' is an anagram indicator.
'rap' put after 'disco' is 'discorap'.
'discorap' is an anagram of 'SPORADIC'.

Can you help me to learn more?

(Other definitions for sporadic that I've seen before include "Having separate patches" , "Occurring infrequently" , "Occurring here and there, like picadors" , "Occurring here and there, scattered" , "Scattered - irregular" .)

I've seen this clue in The Hindu.
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