Chop the first two letters of clue one to obtain the answer to clue two.
1) Stop doing > That thing
2) Peculiar behaviour > Annoy
3) Subatomic particle > Large Boat
4) Unit of liquid measure > Product of creativity
5) Small game bird > To be unwell
6) Large feather, pen > Unwell, faulty
7) Nausea, uncomfortable > Simple
8) Misgivings, scruples > Donations to the poor