Prepared to go round a bottomless piece of ice that's steep (8)
I believe the answer is:
marinade
'that's steep' is the definition.
(to steep is to marinade or soak)
'prepared to go round a bottomless piece of ice' is the wordplay.
'prepared' becomes 'made' ('make' can be a synonym of 'prepare').
'to go round' indicates putting letters inside.
'bottomless' means to remove the last letter.
'piece of ice' becomes 'rink' (ice rink).
'rink' with its final letter removed is 'rin'.
'a'+'rin'='arin'
'made' placed around 'arin' is 'MARINADE'.
(Other definitions for marinade that I've seen before include "Steep in flavourings" , "Spicy liquid for soaking meat or fish" , "Soak in a mixture before cooking" , "thorough soaking" , "In a dream (anag.)" .)