Crossword Genius

Not over heavy? (3)

Ross

I believe the answer is:

ton

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

'heavy?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'not over' is the wordplay.
'over' says the letters should be written in reverse.
'not' backwards is 'TON'.

Can you help me to learn more?

(Other definitions for ton that I've seen before include "Style" , "A slang 100mph - heavy" , "A slang 100 mph" , "Fashionable" , "Speed" .)

I've seen this clue in the Evening Standard.
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