Crossword Genius

Regulation pants Ronnie cadged, half-cropped (9)

Ross

I believe the answer is:

ordinance

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'regulation' is the definition.
('ordinance' can be a synonym of 'regulation')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for ordinance that I've seen before include "Regulation" , "planning" , "practice" , "Command" , "religious service maybe" .)

I've seen this clue in The Telegraph.
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