Clue: Every step up an Italian mountain the bounder has to climb — that's some trip! (10)
Answer: TARANTELLA
Explanation: Definition: trip
Reverse of ALL ETNA RAT (I suppose ALL ETNA is 'Every step up an Italian mountain'). The tarantella (supposed to have originated from the convulsive reaction to a spider's bite) is an energetic dance, or 'trip'