One who entertains crowd (4)
I believe the answer is:
host
This clue is a double definition.
'one who entertains' is the first definition.
(I've seen this before)
'crowd' is the second definition.
(both can mean a large number of people)
(Other definitions for host that I've seen before include "lot of people" , "Army; publican" , "Master of ceremonies" , "Multitude -- MC" , "Entertainer of guests" .)