@adippered,
15d arctic inhabitant overturns law right in front of us = walrus (law r us)
23d hunt out a polecat = ferret (hunt out is ferret, polecat is ferret)
29daggression shown by presenter with plenty of ability = host-ility
47a where a pin can alter the balance = ATM (automatic teller machine)
Hope this helps, I was stuck on 14down for a few days