People referred to on the 4th of July? (4)
I believe the answer is:
they
'people referred to' is the definition.
'on the 4th of july?' is the wordplay.
'on' says to put letters next to each other.
'4th of july?' becomes 'y' (4th letter of 'july').
'the' put next to 'y' is 'THEY'.
(Other definitions for they that I've seen before include "Do -- Know It's Christmas (Band Aid)" , "People generally" , "Those people (vb. subject)" , "Pronoun for more than one" , "Pronoun for people" .)