Robin Goodfellow's game (5)
I believe the answer is:
bingo
'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" .)