Crossword Genius

It starts here (5)

Ross

I believe the answer is:

aitch

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'it starts here' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

Can you help me to learn more?

(Other definitions for aitch that I've seen before include "Aspirated letter" , "It's dropped by Cockneys" , "The letter h in full" , "first bit of hymn?" , "bone" .)

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