Discarded means of making jam set (6)
I believe the answer is:
jetsam
'discarded means' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'making jam set' is the wordplay.
'making' indicates an anagram.
'jam'+'set'='jamset'
'jamset' is an anagram of 'JETSAM'.
'of' is the link.
Can you help me to learn more?
(Other definitions for jetsam that I've seen before include "lost cargo" , "stuff washed ashore" , "Unwanted stuff thrown overboard" , "Goods thrown overboard from ship in distress" , "Objects thrown overboard" .)