Does he entertain a big crowd? (4)
I believe the answer is:
host
'crowd?' is the definition.
(I've seen this in other clues)
'does he entertain a big' is the wordplay.
'does he' becomes 'ht' (I can't explain this - if you can you should believe this answer much more).
'entertain' means one lot of letters goes inside another.
'a big' becomes 'os'.
'ht' enclosing 'os' is 'HOST'.
Can you help me to learn more?
(Other definitions for host that I've seen before include "Master of ceremonies" , "Provide entertainment" , "Party giver" , "Landlord; army" , "This man entertains" .)