### Clue: Bird trying to keep a low profile when interrupted by the man of 18 (6,6,4)
### Answer: MARTIN LUTHER KING 
 ### Explanation: Definition:  man of 18
  MARTIN(any of several swallows,birds) + [LURKING(trying to keep a low profile, and even hiding) **containing**(when interrupted by) THE]. 
Answer: Junior, US civil rights activist and Nobel Laureate, whose famous speech included the answer to 18 across.