17 down: Yes, one may blow this dough! (4, 5)
A very neat partial &lit: yes, one may blow = easy money = yes, one may blow this dough.

28, 24 across: Contrary source described old admirer’s locale? (5, 4)
Very much enjoyed the definition: contrary source described old = contrary roots described aged = stoor described aged = stage door = admirer’s locale.

3 down: Rings assistant for battery chicken’s second marvel (3, 3, 3)
Very much enjoyed the answer even if, as I’ve just come to realise, I don’t have a complete explanation for the aah part of marvel = ooh and aah.

Can anyone help me on this one?