Cold areas? One cold area turning up here (7)
I believe the answer is:
icecaps
'cold areas?' is the definition.
(area made up of ice)
'one cold area turning up here' is the wordplay.
'one' becomes 'I' (Roman numeral).
'cold' becomes 'c' (eg on taps).
'area' becomes 'space' (space is a kind of area).
'turning up here' says the letters should be written backwards (in a down clue, letters go up).
'space' in reverse letter order is 'ecaps'.
'i'+'c'+'ecaps'='ICECAPS'
(Other definitions for icecaps that I've seen before include "objects being eliminated from the world" , "Cold headgear, perhaps?" , "Glacial areas" , "White sheets" , "Areas of permanent glaciation" .)