### Clue: Dorothy's aunt was introduced to old worker? (5)
### Answer: EMMET 
 ### Explanation: Definition: old worker
 EM(short for Emily, Dorothy's aunt in the series of books starting with "The Wonderful Wizard of Oz") + MET(was introduced to).
Defn: An archaic;old word for "ant", a member of social insects one of whose caste is the worker).