Schooled trio at art courses offered here (9)

I believe the answer is:

trattoria

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'courses offered here' is the definition.
The definition suggests a singular noun which matches the answer.

'schooled trio at art' is the wordplay.
'schooled' indicates anagramming the letters (I've seen this in other clues).
'trio'+'at'+'art'='trioatart'
'trioatart' anagrammed gives 'TRATTORIA'.

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(Other definitions for trattoria that I've seen before include "Place to eat" , "Italian eating establishment" , "Italian restaurant" , "where Italians eat" .)

I've seen this clue in The Times.

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