Iceberg relative (7)
I believe the answer is:
romaine
(Other definitions for romaine that I've seen before include "Cos lettuce" , "lettuce in the US" , "lettuce in America" , "Variety of lettuce" , "Type of lettuce - I arm one (anag)" .)
I believe the answer is:
romaine
(Other definitions for romaine that I've seen before include "Cos lettuce" , "lettuce in the US" , "lettuce in America" , "Variety of lettuce" , "Type of lettuce - I arm one (anag)" .)