Reserve to move briskly feeling the cold (3-5)
I believe the answer is:
ice-bound
'feeling the cold' is the definition.
(I've seen this before)
'reserve to move briskly' is the wordplay.
'reserve' becomes 'ice' (both can mean aloofness).
'to' says to put letters next to each other.
'move briskly' becomes 'bound' (bounding is a kind of moving. I am not sure about the 'briskly' bit.).
'ice'+'bound'='ICE-BOUND'
Can you help me to learn more?
(Another definition for ice-bound that I've seen is " feeling the cold".)