Crossword Genius

One may win it by a head (4)

Ross

I believe the answer is:

toss

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

'a head' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'one may win it by' is the wordplay.
'one may win' becomes 'oss' (I can't explain this - if you can you should give a lot more credence to this answer).
'it' becomes ''t' (abbreviation. e.g. in 'tis).
'by' is a charade indicator (letters next to each other).
'oss' after 't' is 'TOSS'.

Can you help me to learn more?

(Other definitions for toss that I've seen before include "Pitch" , "Flip in the air, sald or coin" , "Lob" , "ball" , "Throw (coin) so as to choose" .)

I've seen this clue in The Guardian and The Globe and Mail.
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