Trades off tyres (6)
I believe the answer is:
treads
'tyres' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps there's a link between them I don't understand?
'trades off' is the wordplay.
'off' is an anagram indicator.
'trades' is an anagram of 'TREADS'.
Can you help me to learn more?
(Other definitions for treads that I've seen before include "mates" , "Sets the foot down." , "Puts the foot down" , "Steps, walks" , "Stared at tyre surfaces" .)