### Clue: First lady originally laying in bed with president (9)
### Answer: ROOSEVELT 
 ### Explanation: Definition: president
 [ EVE(the biblical first lady) + **1st letter of**(originally) "laying " ]**contained in**(in) ROOST(a bed;a place for resting at night, especially for birds).
Answer: Franklin or Theodore, former presidents of the USA, take your pick.