Hoist ladder at university (3,2)
I believe the answer is:
run up
'hoist' is the definition.
('run up' can be a synonym of 'hoist')
'ladder at university' is the wordplay.
'ladder' becomes 'run' ('run' can be a synonym of 'ladder').
'at university' becomes 'up'.
'run'+'up'='RUN-UP'
(Other definitions for run up that I've seen before include "Illingworth had a short one" , "To make or mend hastily" , "Deliveryman's approach" , "Hurriedly sew together" , "race to top of mountain" .)