Like winter coat, light in parts (5)
I believe the answer is:
lined
'like winter coat light in parts' is the definition.
I can't tell whether this definition defines the answer.
'light in parts' is the wordplay.
'light' becomes 'led' (I've seen this before).
'parts' is an insertion indicator (in the sense of cuts or separates).
'led' going around 'in' is 'LINED'.
Can you help me to learn more?
(Other definitions for lined that I've seen before include "Of face, marked with creases and wrinkles" , "Went along with" , "What ruler did" , "pockets may be so filled?" , "Marked by seams or wrinkles" .)