I pass after end of course (3)
I believe the answer is:
ego
'i' is the definition.
(thesaurus)
'pass after end of course' is the wordplay.
'pass' becomes 'go' (going is a kind of passing).
'after' says to put letters next to each other.
'end' says to take the final letters.
The last letter of 'course' is 'e'.
'go' put after 'e' is 'EGO'.
(Other definitions for ego that I've seen before include "Inflated pride" , "Self-esteem, sense of self" , "One's self-image" , "Sense of identity" , "Self-esteem or self-importance" .)