A Eureka moment on 6. Doughnut. Ugh (expression of disgust) ins. do (party) + nut (activist). Doughnutting is when a group of MPs surround a speaker in the otherwise sparsely filled chamber, for the benefit of the TV cameras.
i've just come in and made a start on this - well, on 6, 7 and the link.
Ixion-it would suit me very much if there was an apostrophe missing in the clue to 7. If not, I'm on the wrong track altogether!
Well spotted peterm - in before my hint - I worried slightly as to whether ugh=disgust was fair without mentioning "expression of" but decided stifles pointed in that direction.