As one's missing coat, winter did sound harsh (10)
I believe the answer is:
integrated
'harsh' is the definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?
'as one's missing coat winter did sound' is the wordplay.
I cannot really understand how this works, but
'as' could be 'in' (I've seen this in other clues) and 'in' is found in the answer.
'one' could be 'a' (a thing is one thing) and 'a' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for integrated that I've seen before include "working as a unit" , "Unified" , "Formed into a whole" , "Combined into a whole" .)