Stuck on last four on the top left-hand corner:
1a (5) Swell vet, one almost forgotten. I have --r-e.
16a (7) East German - wealthy person who refuses to recognise reality. I have --t-i--.
1d (6) sounds like lukewarm support for head of sixth-form college. I have --h---.
4d (7) A saint - what could make one sin? I have s-i---n.
As this was a fairly easy week, I'm sure I'm going to kick myself.