Case of online tuition (4)
I believe the answer is:
etui
'case' is the definition.
(I've seen this before)
'of online tuition' is the wordplay.
'of' indicates the answer is hidden within the clue.
'ETUI' is hidden in the letters of 'online tuition'.
(Other definitions for etui that I've seen before include "Ornamental bag for needles etc." , "Sewer's case" , "Case containing sharp objects" , "Small needle case e" , "Small case for small things" .)