I'm having trouble with the last few (to be honest, I'm having trouble parsing quite a few I think are right!) There is a sort of
Simpsons theme.
Any hints for 17a?
Small job outside Springfield? (5)
D???Y
I'm thinking DIY for the job, which suggests either DIDDY or DINKY, but I can't see what either DD or NK has to do with Springfield (Simpsons or otherwise).