Crossword Genius

Least worthy vote that’s mailed? (7)

Ross

I believe the answer is:

poxiest

I'm a little stuck... Click here to teach me more about this clue!

'least worthy vote that's mailed?' is the definition.
I can't tell whether this definition defines the answer.

'vote that's mailed?' is the wordplay.
I cannot really see how this works, but
'vote' could be 'x' (how votes are marked) and 'x' is found in the answer.
'that's' could be 'ie' and 'ie' is found within the answer.
The remaining letters 'post' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

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