I think I have it - tache. The theme is parts of the body, so this would fit (more or less)> belly is very good (on reflection - I think you're right! Very clever!) Always the way - get an answer and it contradicts another 2 already entered. Back to the drawing board. Thanks dannyK13.
Breast milk (milk drunk in the middle of class at school). We're stuck on last two: 5a we want to be 'armless' but can't work out why. 29a Throws empty vessel ?n?e?t?