Leaders with a fifty-fifty chance of falling on their faces? (5)

I believe the answer is:

heads

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'leaders' is the definition.
(head is a kind of leader)

I can't explain the remainder of the clue.

(Other definitions for heads that I've seen before include "Obverse result of coin-tossing" , "Goes for" , "Chiefs" , "Obverse of a coin" , "School principals" .)

I've seen this clue in the Evening Standard.

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