Jumbo 698

[tortoise62]

55ac has me beaten (though no-one else seems to be asking about it!): They keep guard up as artist completes "Blue Planet". (3,8) I have S-Y, -E-S-A-S

[shaneystar2]

Sky marshals Sky (up) (Mars) Hals ..artist

[erleichda]

I would have said Sky (Blue) Mars (Planet) Hals (Artist) with up referring to the fact they keep the peace in the air.

[Francis Asis]

I really struggled with this clue. Thanks for the answer, but I had an E as the second letter, so 47 down must be wrong. I've got SCHEME - an anagram of 75% of cashmere. Can anyone help?
Thanks Francis

[Uncle Tricky]

Francis - 47d is 'SCHEMA'. I originally had the same answer as you.

[tortoise62]

Many thanks to you all. Schema and sky marshals it is.

[booknerd]

Ditto Uncle Tricky. I also had 'scheme' instead of 'scheme'. Glad to get the right answer at last. Thank you.