Some exotic horizontal sausage (7)
I believe the answer is:
chorizo
'sausage' is the definition.
(type of sausage)
'some exotic horizontal' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'CHORIZO' can be found hidden inside 'exotic horizontal'.
(Other definitions for chorizo that I've seen before include "Spiced sausage" , "foreign meat" , "Spicy Spanish pork sausage" , "Highly-seasoned sausage" , "food from the deli" .)