Better question is - How do you not beat a hunter?
a good hunter will beat a feral everytime.
How to beat a hunter as a feral (1on1)?
Turn up to the fight....
not even sure what this means.
Honestly get your 5 cp rip up on him asap. One full duration rip+rake is enough to bring him to 50% health or below. I usually do this through pounce---->build 5 cps before the stun is over.
If he has a trap under him and you know you'll be trapped when you open simply be ready to trinket.
If you keep getting caught in stealth then remember that hunter's don't see any better behind them than anyone else, even with track hidden. So make a wide arc around him and open from behind.
If you can't get in range of them, aka rooted with both root breaks down or some other nonsense then sit in bear. No sense taking extra damage.
Bear form charge on cd, this should be every 14 seconds if charge is glyphed, which it should be. Stay in that hunter's face and he will do little to no damage to you.
Shift scare beasts, and barkskin if you're trapped and he's setting up a trap--->aimed shot.
Oh almost forgot a really fun thing to do that confuses 99% of hunters lol, use PS procs to hibernate his pet. He won't be able to blind, etc and if he masters calls while his pet's hibernated it will use the CD but nothing will happen :).
And use skull bash as a second gap closer, nothing else if we're talking a true 1v1 situation.