Crossword Genius

Chemically treat disease I found in yellow fruit (10)

Ross

I believe the answer is:

fluoridate

'chemically treat' is the definition.
(eg water can be fluoridated)

'disease i found in yellow fruit' is the wordplay.
'disease' becomes 'flu' (flu is a kind of health problem).
'found in' is an insertion indicator.
'yellow' becomes 'or' (heraldic term).
'fruit' becomes 'date' (date is a kind of fruit).
'or'+'date'='ordate'
'i' put within 'ordate' is 'oridate'.
'flu'+'oridate'='FLUORIDATE'

I've seen this clue in The Times.
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