International tempo raised to support cold part of planet (6)
I believe the answer is:
icecap
'part of planet' is the definition.
'international tempo raised to support cold' is the wordplay.
'international' becomes 'i' (abbreviation eg in IMF).
'tempo' becomes 'pace' ('pace' can be a synonym of 'tempo').
'raised' shows that the letters should be reversed in order.
'to support' says to put letters next to each other.
'cold' becomes 'c' (eg on taps).
'pace' in reverse letter order is 'ecap'.
'ecap' put after 'c' is 'cecap'.
'i'+'cecap'='ICECAP'
(Other definitions for icecap that I've seen before include "Cold mass permanently covering the polar regions or mountain peaks" , "Polar expanse" , "covering in frozen north" , "hard water area" , "Frozen top of mountain etc" .)