Maddens with ridiculous requirements (7)

I believe the answer is:

demands

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'requirements' is the definition.
('demand' can be a synonym of 'requirement')

'maddens with ridiculous' is the wordplay.
'maddens' can be anagrammed to 'DEMANDS'.
However, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for demands that I've seen before include "Orders" , "Requires" , "Requests forcefully" , "Asks peremptorily" , "Insistent requests" .)

I've seen this clue in the Evening Standard.

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