Walked off, missing kilometres in wooded area (5)
I believe the answer is:
weald
'wooded area' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for weald that I've seen before include "area of woodland" , "Open or wooded country" , "The ___, area between the North and South Downs" , "Area of open or forested country" , "Fertile area between N. and S. Downs" .)