Here's my tenpenn'orth:
3D ZIP is the definition; SC is the state; (I searched Google for state abbreviations beginning with S); TOO is a synonym of "further" and it is reversed.
This was nice! Keep them coming :) The only one that confused me was 4D because I didn't see a reversal indicator for RACE i.e. rush back/ run behind but perhaps it's not needed - I still got the answer!
I did wonder about that, but thought it would be covered by the anagram instruction, which happens to arrange the letters backwards. Thanks for the feedback :)
About 4D I have read your parsing and also the reply by Iris. I agree that there should be a reversal indicator; conventionally, an anagram must be of the letters RACE, not a synonym. This is not intended as criticism, merely advice.