Watch Biden ... (6)
I believe the answer is:
hunter
'watch' is the definition.
(hunter is a kind of watch)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for hunter that I've seen before include "Orion -- pocket watch with a hinged protective lid" , "One chasing - type of watch" , "See 13" , "See 10" , "Watch with hinged cover" .)