The charade clue's spread pain? (7,8)

I believe the answer is:

cluster headache

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'pain?' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'the charade clue's spread' is the wordplay.
'spread' is an anagram indicator.
'the'+'charade'+'clues'='thecharadeclues'
'thecharadeclues' anagrammed gives 'CLUSTER HEADACHE'.

Can you help me to learn more?

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

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