Robin Goodfellow's game (5)

I believe the answer is:

bingo

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

'game' is the definition.
(bingo is a game)

'robin goodfellow's' is the wordplay.
'BINGO' is hidden within the letters.
But, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for bingo that I've seen before include "Game in which "two little ducks" might be called" , "game requiring little ability" , "Voila!" , "Popular gambling game in which numbers are called at random" , "Number-calling game" .)

I've seen this clue in The Globe and Mail and the Evening Standard.

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