As you'll know it takes me a while to do the Saturday crossword but this week worse than ever!
Mention of a mechanical piece in the isthmus (9)
N?m??????
Also. Deterrent rebid Waugh's work for passing time (5,5,3,6). I've got a couple of letters but I'm not sure they're right!
And I cannot even get the sense of the clue to 21,8 so I won't bore you with it :-)