Arrange neatly in box for holding small objects at university (4,2)
I believe the answer is:
tidy up
'arrange neatly in box for' is the definition.
I can't judge whether this definition defines the answer.
'small objects at university' is the wordplay.
'small objects' becomes 'tidy' (I can't explain this - if you can you should give a lot more credence to this answer).
'at university' becomes 'up' (slang term meaning at university).
'tidy'+'up'='TIDY-UP'
'holding' acts as a link.
Can you help me to learn more?
(Other definitions for tidy up that I've seen before include "Put things back in their places" , "Make neater" , "Make neat" , "Put (things or places) in order" , "Neaten" .)