Crossword Genius

Positive thing in favour of weight (6)

Ross

I believe the answer is:

proton

'positive thing' is the definition.
(I've seen this before)

'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'

(Other definitions for proton that I've seen before include "One charged" , "Positively charged particle" , "Stable subatomic particle" , "Particle in atoms" , "Positive nucleon" .)

I've seen this clue in The Daily Express.
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