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The opposite of a sun bonnet? (6)

Ross

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6

3,3

icecap

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'sun bonnet?' is the definition.
The answer and definition can be both natural objects as well as being singular nouns.
Maybe there's an association between them I don't understand?

I don't understand the rest of the clue.

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(Other definitions for icecap that I've seen before include "what's on mountain peak?" , "Permanent coating of white on a mountain-top" , "frozen peak" , "mass covering the top of Everest?" , "Frozen topping" .)

I've seen this clue in The Globe and Mail and The Guardian.
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