### Clue: North American scientific establishment rejected church correspondence (7)
### Answer: BALANCE 
 ### Explanation: Definition: correspondence
 **Reversal of**(… rejected) [NA(abbrev. for North American) + LAB(short for "laboratory"/an establishment for scientific testing and experimenting)] + CE(abbrev. for the Church of England).
Defn: The condition of different elements in a situation being equivalent/corresponding to each other.