Defog clears your enemy's entry hazards (along with Light Screen etc.), but is Rapid Spin the only move that clears your own entry hazards?
I know a non-flying/ levitating Poison type will absorb Poison Spikes, but is that it?
Mortal Spin clears hazards from the user's side of the field, similarly to Rapid Spin. These two are unique in removing hazards from only the user's side.
Court Change swaps the placement of hazards between sides, effectively acting as removal if your opponent’s side is empty.
No, there isn't.
However, the ability Magic Bounce prevents opponents from setting up hazards on your side. Similarly, Magic Coat (move) prevents hazards also.
(I know this because I love tandmous) The move 'Tidy Up' also does the same, and even increases the attack and speed stat.
Tidy Up raises the user's Attack stat and Speed stat by one stage each. It also clears away substitutes, Spikes, Toxic Spikes, Stealth Rock, and Sticky Web on both the user's and target's side of the field. The user's stats will still be raised even if there are no traps or substitutes to remove.