Crossword Genius

It may come back to one's ear (4)

Ross

I believe the answer is:

toot

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'one's ear' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'it may come back to' is the wordplay.
'it' becomes ''t' (abbreviation. e.g. in 'tis).
'may' becomes 'o' (I can't justify this - if you can you should believe this answer much more).
'come back' shows that the letters should be reversed in order.
'to' backwards is 'ot'.
't'+'o'+'ot'='TOOT'

Can you help me to learn more?

(Other definitions for toot that I've seen before include "Briefly blow" , "Short sound of horn" , "Brief blast on a horn" , "Short sounding of horn" , "Use horn" .)

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