I may be a bit late with this but..
13A - think 'bad' for 'wrong'
13D - 'we hear' is the indicator
3D - Where something might be hidden, but if it's not then it's nothing...
23D - indicator is 'passionate' with letters exchanged
27D - A nice bit of mis-direction - I thought this was quite clever
29A - for 'case', think legal.