Crossword Genius

Little bit in favour of weight (6)

Ross

I believe the answer is:

proton

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'little bit' is the definition.
The definition and answer can be both natural objects as well as being singular nouns.
Maybe there's a link between them I don't understand?

'in favour of weight' is the wordplay.
'in favour of' becomes 'pro' (being pro a particular cause).
'weight' becomes 'ton' (unit of weight).
'pro'+'ton'='PROTON'

Can you help me to learn more?

(Other definitions for proton that I've seen before include "One's charged" , "Positively charged particle" , "One charged" , "Nuclear particle with positive charge" , "Particle in atom nucleus" .)

I've seen this clue in The Mirror.
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