Crossword Genius

It's easy removing carbon - just a small amount (4)

Ross

I believe the answer is:

inch

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'small amount' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for inch that I've seen before include "nose" , "Move in tiny increments" , "Edge along" , "A very little" , "... or not so long < , Celtic island" .)

I've seen this clue in The Irish Times.
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