Cold in HGV in polar region (6)
I believe the answer is:
arctic
'polar region' is the definition.
(I've seen this before)
'cold in hgv' is the wordplay.
'cold' becomes 'c' (eg on taps).
'in' means one lot of letters goes inside another.
'hgv' becomes 'artic' (I am not sure about this - if you are sure you should believe this answer much more).
'c' going into 'artic' is 'ARCTIC'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for arctic that I've seen before include "Relating to the cold North" , "Poplar region" , "Cold region in the northern hemisphere" , "Extremely cold" , "Northern ocean" .)