Crossword Genius

Even flipping 50%, initially switching heads and tails (4)

Ross

I believe the answer is:

flat

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'even' is the definition.
(similar in meaning)

I can't explain the rest of the clue.

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(Other definitions for flat that I've seen before include "with no relief" , "like some races" , "Puncture" , "Level - uninteresting - accommodation" , "unexciting" .)

I've seen this clue in The Guardian.
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