Thanks rusty & zozozo. Just one left:
15A Art articulating for folk in street (6) - S?YES?
I think this must be SAYEST (articulating?) being AYES (folk???) inside ST (street). However, it's very tenuous and I can't parse "Art" at all.
The only other words I can find to fit are SHYEST and SLYEST, neither of which make sense.