Crossword Genius

Joke, say, about duke unable to speak (6)

Ross

I believe the answer is:

gagged

'unable to speak' is the definition.
(someone wearing a gag cannot speak)

'joke say about duke' is the wordplay.
'joke' becomes 'gag' (a gag is a joke or witticism).
'say' becomes 'eg' (both can mean for example).
'about' shows that the letters should be reversed in order.
'duke' becomes 'd' (abbreviation).
'eg' reversed gives 'ge'.
'gag'+'ge'+'d'='GAGGED'

(Other definitions for gagged that I've seen before include "Struggled for breath or prevented from speaking out" , "Silenced" , "Muffled or retched" , "Not allowed to speak out" .)

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