Crossword Genius

As a joke, it's less than engaging (3)

Ross

I believe the answer is:

gag

I'm a little stuck... Click here to teach me more about this clue!

'as' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'a joke it's less than engaging' is the wordplay.
'GAG' is hidden in amongst the letters.
But, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for gag that I've seen before include "Retch at the joke?" , "Muzzle or silence" , "that renders one speechless" , "Silence the joke" , "Censor" .)

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