Cautioned about tuition (9)
I believe the answer is:
'tuition' is the definition.
'cautioned about' is the wordplay.
'about' indicates an anagram.
'cautioned' anagrammed gives 'EDUCATION'.
(Other definitions for education that I've seen before include "Process of acquiring knowledge" , "Cautioned (anag)" , "Theory and practice of teaching" , "Teaching process" , "New Labour mantra, when repeated" .)