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' anagrams to 'DEMANDS'.
Though, I am unsure how the anagram 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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