### Clue: Island athlete once rounding wild fell overlooking lake, hazard in wintry climes? (3,4)
### Answer: ICE FLOE 
 ### Explanation: Definition: hazard in wintry climes
 I(abbrev. for "island") + COE(Baron Sebastian, an retired English athlete) **containing**(rounding) **anagram of**(wild) FEL{"fell" **minus**(overlooking) "l"}.
Answer: A marine hazard in ice-cold regions.