Crossword Genius

Face up to unpleasant situation: eat lead? (4,3,6)

Ross

I believe the answer is:

bite the bullet

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'face up to unpleasant situation' is the definition.

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

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(Other definitions for bite the bullet that I've seen before include "Taste dismissal" , "Be stoical" , "Decide on unpleasant action" , "Grapple with a problem head on" , "Grasp the nettle" .)

I've seen this clue in The Guardian.
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