Blimey...for a puzzle themed around being puzzled, Paul led me a merry dance.
Only finished up this morning, which either shows I'm very persistent or stupid, I'm not sure which.
Thanks to all for hints on 6D, 19D and 26A, all of which were puzzling me.
FOI 8A
LOI 26A
COTD 18D, which even as a climber, too me way too long to spot!