Crossword Genius

Type of rule (3)

Ross

I believe the answer is:

gag

'type of rule' is the definition.

This is all the clue.

(Other definitions for gag that I've seen before include "Stop someone telling" , "Kind of muzzle or informal joke" , "Muffle with slang joke" , "Joke (colloq.)" , "Stop the mouth with a joke" .)

I've seen this clue in the Penny Press.
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