### Clue: What builders like to make – good stone art (6,3)
### Answer: STRONG TEA 
 ### Explanation: Definition: What builders like
 **Anagram of**(to make) [ G(abbrev. for "good") + STONE ART].
Defn: Cryptic reference to the inexpensive, strongly brewed, milky and very sweet beverage, colloquially named after construction workers, who supposedly like it, and which supposedly increases their output.
And Thatcher worked in J.Lyons, which had a chain of teashops and cafes.  See also 8 down.