Walk to embrace cold spell (5)
I believe the answer is:
patch
'spell' is the definition.
(I know that patch can be written as patch)
'walk to embrace cold' is the wordplay.
'walk' becomes 'path' (I've seen this in another clue).
'to embrace' means one lot of letters goes inside another.
'cold' becomes 'C' (eg on taps).
'path' placed around 'c' is 'PATCH'.
(Other definitions for patch that I've seen before include "Mend by adding fabric" , "Covering material" , "Piece of cloth put on another" , "Small piece of ground" , "Piece of cloth as decoration or to cover a hole" .)