Presenter shot off (4)
I believe the answer is:
host
'presenter' is the definition.
(as in the host of a TV show)
'shot off' is the wordplay.
'off' indicates an anagram.
'shot' anagrammed gives 'HOST'.
(Other definitions for host that I've seen before include "Pub landlord" , "large group of people" , "TV presenter; large number" , "Large crowd" , "Present" .)