Crossword Genius

The game is of trifling significance (9)

Ross

I believe the answer is:

bagatelle

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'the game' is the definition.
(bagatelle is a kind of game)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for bagatelle that I've seen before include "Trinket - game played on a board with balls" , "Something trivial" , "piece, one for piano" , "Musical item" , "Unimportant thing" .)

I've seen this clue in The Irish News.
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