Clue: Prepared to go round a bottom­less piece of ice that's steep (8)
Answer: MARINADE
Explanation: Definition: steep
An envelope ('to go round') of 'a' plus RIN[k] ('piece of ice') minus its last letter ('bottomless' in a down light) in MADE ('prepared'). Quite devious, with not the first 'piece of ice' that comes to mind, and the definition 'steep' as a verb.