Frozen wildernesses found over in Room 101 (3,4)

I believe the answer is:

ice caps

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'frozen wildernesses' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'over in room 101' is the wordplay.
'over' says the letters should be written in reverse.
'in room' becomes 'space' (room can mean space or an empty area. I am not sure about the 'in' bit.).
's0s' becomes 'CI' (roman numerals).
'space'+'ci'='spaceci'
'spaceci' in reverse letter order is 'ICE-CAPS'.

'found' is the link.

Can you help me to learn more?

I've seen this clue in The Independent.

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