### Clue: Deer eat head of lettuce in the US (7)
### Answer: ROMAINE 
 ### Explanation: Definition: lettuce in the US
  ROE(the roe deer of Eurasia, the most famous of whom was Bambi) *containing*(eat) MAIN(head,the important bit,chief)
Defn:  Another word for the cos lettuce, given in some references as of US and Canadian usage, though my experience is that the word is used quite extensively around the world.