To cheat at bagatelle is not on the level (4)

I believe the answer is:

tilt

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'the level' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe there's an association between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for tilt that I've seen before include "Slope; use a lance in jousting" , "Engage in a medieval joust - lean" , "Slope; joust" , "Incline, lean" , "Stab" .)

I've seen this clue in the Evening Standard.

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