Outspoken shark hunter (7)
I believe the answer is:
cheetah
'hunter' is the definition.
(cheetahs are predators)
'outspoken shark' is the wordplay.
'outspoken' shows a homophone (sound like) (as the word might be spoken).
'shark' becomes 'cheater'.
'cheater' is a homophone of 'CHEETAH'.
(Other definitions for cheetah that I've seen before include "Fast predator" , "Fast-moving creature" , "Beast" , "Swift predator" , "African native" .)