Pole features in Room 101 making comeback (7)
I believe the answer is:
icecaps
'pole features' is the definition.
Although both the answer and definition are plural nouns, I don't see how one could define the other.
'room 101 making comeback' is the wordplay.
'room' becomes 'space' (room can mean space or an empty area).
'101' becomes 'CI' (roman numerals).
'making comeback' says the letters should be written backwards.
'space'+'ci'='spaceci'
'spaceci' backwards is 'ICECAPS'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for icecaps that I've seen before include "White sheets" , "They cover Poles" , "Areas of permanent glaciation" , "Cold headgear, perhaps?" , "Glacial areas" .)