They are meant to instruct the French boys (7)

I believe the answer is:

lessons

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'they are meant to instruct' is the definition.
The definition suggests an adverb but the answer is not.

'the french boys' is the wordplay.
'the french' becomes 'les' (plural form of 'the' in French).
'boys' becomes 'sons' ('son' can be a synonym of 'boy').
'les'+'sons'='LESSONS'

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(Other definitions for lessons that I've seen before include "They're learnt" , "Tutorials" , "Teaching periods" , "Units of instruction" , "Lectures" .)

I've seen this clue in The Irish News.

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