Detectives I upset with regulation about mockery (8)
I believe the answer is:
ridicule
'mockery' is the definition.
(I know that mockery can be written as ridicule)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for ridicule that I've seen before include "Pour scorn on" , "satire" , "Laugh at or deride" , "Mock, make fun of." , "guy" .)