Mini gears crashed? Painful stuff (9)

I believe the answer is:

migraines

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'mini gears crashed? painful stuff' is the definition.
I can't judge whether this definition defines the answer.

'mini gears crashed?' is the wordplay.
'crashed?' indicates anagramming the letters (I've seen 'crashed' mean this).
'mini'+'gears'='minigears'
'minigears' is an anagram of 'MIGRAINES'.

Can you help me to learn more?

I've seen this clue in The Independent.

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