Non-iron canisters are set in order (6-9)
I believe the answer is:
'non-iron' is the definition.
Both the definition and answer are adjectives.
Perhaps they are linked in a way I don't understand?
'canisters are set in order' is the wordplay.
'in order' indicates anagramming the letters (the letters in a new order).
'canistersareset' anagrammed gives 'CREASE-RESISTANT'.
Can you help me to learn more?