1a) It's almost certain to be added to excess (7)
1d) After he left, Bathsheba ordered day of rest (7)
2d) Jumper (mellow) Keeps spleen at about 20 degrees C (4,11)
5a) Mad psychiatrist lacking chairs for office worker (6)
16d) Grind crown of tooth during disrupted sleep (6)
Apology for no letters. All help much appreciated