The answers all contain 'OO' eg it sustains us answer Food
4. A good place to be musically (6)
11. Young female investigative reporter (6 & 6)
17. A president in Antarctica (9 & 6)
20. Pacific Islands (4 & 7)
22.. Once a burial requirement (4) Could this be Food?
29. It's just not acceptable (5) Could this be hoody?