14 across
Video
game
reversed
practice:
that’s
not
right
(8)
Video game reversed practice: that’s not right (8)
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The definition is at the end of the clue.
How the clue works
That's not right is your definition — something improper or abused. SIM (the video game, as in The Sims) gets reversed to give you MIS, and you stick that in front of USAGE (practice) to build the whole thing.