Basil's worked with these institutes (11)
I believe the answer is:
establishes
'institutes' is the definition.
('establish' can be a synonym of 'institute')
'basil's worked with these' is the wordplay.
'worked with' indicates anagramming the letters.
'basils' mixed up with 'these' can make 'ESTABLISHES'.
I've seen this clue in The Times.
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