Crossword Genius

Leads or follows? It's decided by tossing a coin (5,2,5)

Ross

I believe the answer is:

heads or tails

I'm a little stuck... Click here to teach me more about this clue!

'decided by tossing a coin' is the definition.
I can't judge whether this defines the answer.

'leads or follows?' is the wordplay.
'leads' becomes 'heads' (heading is a kind of leading).
'follows?' becomes 'tails' (I've seen this in another clue).
'heads'+'or'+'tails'='HEADS OR TAILS'

'it's' acts as a link.

Can you help me to learn more?

(Other definitions for heads or tails that I've seen before include "phrase?" , "Choice" , "Coin-tossing question" .)

I've seen this clue in The Irish Times.
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