Gambled on not starting chilled (4)
I believe the answer is:
iced
'chilled' is the definition.
(icing is a kind of chilling)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for iced that I've seen before include "Having a sugary coating" , "found thus in freezer?" , "Decorated with frosting" , "What cake might be" , "Frosted over" .)