Crossword Genius

Measured over half of amount provided I lead occasionally (10)

Ross

I believe the answer is:

quantified

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'measured' is the definition.
('quantify' can be a synonym of 'measure')

'half of amount provided i lead occasionally' is the wordplay.
'half of amount' becomes 'quant' (I can't justify this - if you can you should believe this answer much more).
'provided' becomes 'if' (eg 'provided it's sunny' means 'if it's sunny').
'occasionally' indicates alternate letters.
'i'+'lead'='ilead'
The alternate letters of 'ilead' are 'ied'.
'quant'+'if'+'ied'='QUANTIFIED'

'over' acts as a link.

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I've seen this clue in The Telegraph.
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