### Clue: Publication priest set up that's mercurial? (7)
### Answer: AMALGAM 
 ### Explanation: Definition: that's mercurial
 **Reversal of**(… set up, in a down clue) [ MAG(short for "magazine";a publication) + LAMA(a Tibetan priest) ].
Answer: An alloy of various metals including mercury, used as dental filling.