Reveal the French weight (5)

I believe the answer is:

leton

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'reveal' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'the french weight' is the wordplay.
'the french' becomes 'le' ('the' in French).
'weight' becomes 'ton' (unit of weight).
'le'+'ton'='LETON'

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I've seen this clue in The Daily Express.

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