Perhaps hunters seem excited with horn (8)
I believe the answer is:
horsemen
'perhaps hunters' is the definition.
I can't judge whether this definition defines the answer.
'seem excited with horn' is the wordplay.
'excited with' indicates anagramming the letters.
'seem' with its letters anagrammed with 'horn' gives 'HORSEMEN'.
Can you help me to learn more?
(Other definitions for horsemen that I've seen before include "The Bible has Four . . . . . . . . of the Apocalypse" , "knights, perhaps" , "Riders" .)