Tested join unsatisfactorily - discarded (10)

I believe the answer is:

jettisoned

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'discarded' is the definition.
(jettisoning is a kind of discarding)

'tested join unsatisfactorily' is the wordplay.
'tested join' anagrams to 'JETTISONED'.
However, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for jettisoned that I've seen before include "Thrown overboard" , "Threw away" , "Discarded" , "thrown out of plane" , "Thrown away" .)

I've seen this clue in the Sydney Morning Herald.

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