### Clue: Saw one in Glasgow filling sink (6)
### Answer: SAYING 
 ### Explanation: Definition: Saw
 YIN("one", referring to someone or something in Scottish, and hence Glaswegian, slang) **contained in**(filling) SAG(to sink;to bulge downwards).
Defn: …, or proverb.**
..a Glaswegian nicknamed The Big Yin.