Crossword Genius

Slip off foreman's bottom (5)

Ross

I believe the answer is:

gaffe

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'slip' is the definition.
(both can mean an error or blunder)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for gaffe that I've seen before include "embarrassing mistake" , "Blundering remark" , "embarrassing error" , "Social blunder" , "Boob" .)

I've seen this clue in the Sydney Morning Herald.
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