2d Space traveller faced carbon monoxide first C?m?? Comet??
6d Sound of horseplay from people next door ? not half Neigh ?
8d Acted as agent after salesman left and felt bitter Resented ?
15d No 10 was prepared to block money for helmsmen C?x?w???s
28a Number needing drink excludes son T?????
17d Send out group in Yosemite
I would be grateful for any help on these as i am new to Cryptics