Crossword Genius

Warning which way the coin might fall (5,2)

Ross

I believe the answer is:

heads up

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'warning' is the definition.
(I know that heads-up is a type of warning)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for heads up that I've seen before include "Alert" , "Warning of impending event" , "Word to the wise" .)

I've seen this clue in The Daily Express.
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