### Clue: Old joke about chicken crossing street even aunt will follow (8)
### Answer: CHESTNUT 
 ### Explanation: Definition: Old joke
 C(abbrev. for "circa";about with reference to time periods) + HEN(a chicken when it's grown a bit) **containing**(crossing) ST(abbrev. for "street") **placed before**(… will follow, in an across clue) **2nd and 4th letters of**(even) "aunt".