A great many shot off (4)
I believe the answer is:
host
'a great many' is the definition.
(as in 'a host of golden daffodils')
'shot off' is the wordplay.
'off' indicates an anagram.
'shot' is an anagram of 'HOST'.
(Other definitions for host that I've seen before include "Multitude -- MC" , "Large crowd" , "Landlord; army" , "This man entertains" , "Entertainer; army" .)