Thanks very much, buddy. It's in neither the BRB nor Bradford and a google search corrects to IJAW, so that's a really sneaky clue. There were several other similarly sneaky clues in a very tough puzzle.
10a Used trickery on engaging Washington floater picked from natural setting (11) ??????A?T??
6d Traveller saw the sights of alternatively named isle (7) D???K?A
Hi xwordfan, might the final letter in 6d be wrong?
Didakai (a variant of diddicoy)
did (as in "do" Paris (or wherever), past tense) + aka (also known as) + i (island)