Goes back over roads blocked by a tree that's collapsed (8)
I believe the answer is:
retreads
'goes back' is the definition.
The answer and definition can be both related to change as well as being verbs in their -s form.
Maybe they are linked in a way I don't understand?
'roads blocked by a tree that's collapsed' is the wordplay.
'roads' becomes 'rds' (abbreviation).
'blocked by' means one lot of letters goes inside another (block can mean to plug a gap in something).
'that's collapsed' indicates an anagram.
'a'+'tree'='atree'
'atree' with letters rearranged gives 'etrea'.
'rds' enclosing 'etrea' is 'RETREADS'.
'over' acts as a link.
Can you help me to learn more?
(Other definitions for retreads that I've seen before include "Serrated like remoulded tyres" , "Serrated like tyres restored for use" , "Arrested over resurfaced tyres" , "They gain fresh employment" , "recovered tyres" .)