Instruction from teachers, perhaps workers at university (5,2)
I believe the answer is:
hands up
'instruction from teachers' is the definition.
(a teacher might ask pupils to put their hands up)
'workers at university' is the wordplay.
'workers' becomes 'hands' (hand is a kind of worker).
'at university' becomes 'up' (slang term meaning at university).
'hands'+'up'='HANDS UP'
'perhaps' acts as a link.
(Other definitions for hands up that I've seen before include "Footpad's instruction" , "Highwayman's instruction" , "Don't resist, I've a gun!" , "call for surrender" , "Who knows" .)