College porter going after the fourth of July (4)
I believe the answer is:
yale
'college' is the definition.
'porter going after the fourth of july' is the wordplay.
'porter' becomes 'ale' (I've seen this in other clues).
'going after' means one lot of letters go next to another.
'the fourth of july' becomes 'y' (fourth letter of the word 'July').
'ale' put after 'y' is 'YALE'.
(Other definitions for yale that I've seen before include "Very important university" , "member of College League" , "University; lock type" , "Member of the 11 - type of lock" , "US university; lock" .)