Pub owner, he entertains a great number (4)
I believe the answer is:
host
I believe this is a triple definition!
'pub owner' is the first definition.
'host' can be an answer for 'owner' (host is a kind of owner). I'm not sure about the 'pub' bit.
'he entertains' is the second definition.
(I've seen this before)
'a great number' is the third definition.
(I've seen this in another clue)
Can you help me to learn more?
(Other definitions for host that I've seen before include "Entertainer; army" , "Compre" , "This man entertains" , "Party giver" , "Present" .)