Crossword Genius

Discarded means of making jam set (6)

Ross

I believe the answer is:

jetsam

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'discarded means' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'making jam set' is the wordplay.
'making' indicates anagramming the letters.
'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" .)

I've seen this clue in the Evening Standard.
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