Regular college class (7)
I believe the answer is:
uniform
'regular' is the definition.
(similar in meaning)
'college class' is the wordplay.
'college' becomes 'uni' (short for university).
'class' becomes 'form' (form class is a kind of class).
'uni'+'form'='UNIFORM'
(Other definitions for uniform that I've seen before include "Distinctive clothing worn by a group" , "Military clothes" , "Regular sort of formal outfit" , "Dress of distinctive design worn by members of a group" , "Official clothing" .)