Ordinary university in America — large (5)
I believe the answer is:
usual
'ordinary' is the definition.
('usual' can be similar in meaning to 'ordinary')
'university in america large' is the wordplay.
'university' becomes 'u'.
'in' is an insertion indicator.
'america' becomes 'usa' ('U.S.A.' can be a synonym of 'america').
'large' becomes 'l'.
'u' inserted into 'usa' is 'usua'.
'usua'+'l'='USUAL'
(Other definitions for usual that I've seen before include "Normal, customary" , "Unexceptional" , "Typical" , "Typically done" , "Accustomed" .)