Hi EscapePod,
It's good to catch up with you again
I have the same answers as you for those Goliathon clues.
For 6d. Disreputable, I have 'shady'
(I think both 'shady' and 'seamy' would be accepted as valid answers for this clue, as they are both listed as synonyms and match the available letters)
For 19a. Confidence trick, I have 'fraud'
Hope this helps. Good luck in the competition EscapePod!
Regards, Butterfly