Winter transport requiring a lot of dexterity (6)
I believe the answer is:
sleigh
'winter transport' is the definition.
(I've seen this in another clue)
'a lot of dexterity' is the wordplay.
'a lot of' means to remove the last letter (a lot of but not all of the word).
'dexterity' becomes 'sleight' (synonyms).
'sleight' with its last letter taken away is 'SLEIGH'.
'requiring' acts as a link.
(Other definitions for sleigh that I've seen before include "Dancer pulled this" , "Reindeer-pulled sledge" , "Transport in winter" , "Santa's vehicle" , "ice, you say, in the Rockies?" .)