You can play it, a mere bagatelle (7)

I believe the answer is:

pinball

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'bagatelle' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for pinball that I've seen before include "It may require tilting when played" , "Slot machine bagatelle" , "Arcade game where a metal sphere negotiates hazards" , "Slot-machine game" , "Electrically operated form of bagatelle" .)

I've seen this clue in the Evening Standard.

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