Crossword Genius

When one performs badly (3-3)

Ross

I believe the answer is:

off-day

(Other definitions for off-day that I've seen before include "Period when one is not at one's best" , "Time when one is not at oneOs best" , "Time when things aren't going too well" , "Not one's best time" .)

I've seen this clue in The Guardian.
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