Sure! Vended clumsily. Not fair (10)

I believe the answer is:

undeserved

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'not fair' is the definition.
Both the answer and definition are adjectives.
Perhaps they are linked in a way I don't understand?

'sure vended clumsily' is the wordplay.
'clumsily' is an anagram indicator.
'sure'+'vended'='surevended'
'surevended' anagrammed gives 'UNDESERVED'.

Can you help me to learn more?

(Another definition for undeserved that I've seen is " Not warranted".)

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

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