Trades badly in stamps (6)
I believe the answer is:
treads
'stamps' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe you can see an association between them that I don't see?
'trades badly' is the wordplay.
'badly' indicates anagramming the letters.
'trades' anagrammed gives 'TREADS'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for treads that I've seen before include "mates" , "Sets the foot down." , "Stared at tyre surfaces" , "Steps, walks" , "Puts the foot down" .)