Tests restricting university to smaller lessons (9)
I believe the answer is:
tutorials
'smaller lessons' is the definition.
'tutorials' can be an answer for 'lessons' (I've seen this before). I'm unsure of the 'smaller' bit.
'tests restricting university to' is the wordplay.
'tests' becomes 'trials' ('trial' can be a synonym of 'test').
'restricting' means one lot of letters goes inside another.
'university' becomes 'u' (abbreviation for university).
'u'+'to'='uto'
'trials' going around 'uto' is 'TUTORIALS'.
Can you help me to learn more?
(Other definitions for tutorials that I've seen before include "University lessons" , "Sessions of intensive teaching given to an individual or small group" , "Individual classes given by personal teacher" .)