### Clue: 23 woman meeting with boat-builder outside (10)
### Answer: SHENANDOAH 
 ### Explanation: Definition: 23
 SHE(3rd party pronoun for a woman) + [AND(meeting with/together with) **contained in**(… outside) NOAH(the Biblical ancestor-figure who built the Ark).
Defn: River/answer to 23 down in the US.