Crossword Genius

Head knocking bishop out on one occasion (4)


I believe the answer is:


'on one occasion' is the definition.

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

(Other definitions for once that I've seen before include "One-time - one time" , "At some time past" , "On one occasion" , "On a single (or past) occasion" , "Quick examination" .)

I've seen this clue in The Times.
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