### Clue: Ancient 3 fellow East German left (6)
### Answer: FOSSIL 
 ### Explanation: Definition: Ancient 3
 F(abbrev. for "Fellow", a member of a learned society) + OSSI(a citizen of the former East Germany) + L(abbrev. for "left").
Defn: Ancient relic (answer to 3 down)/petrified remains of a prehistoric plant or animal.