Regulation pants Ronnie cadged, half-cropped (9)
I believe the answer is:
ordinance
'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" .)