Sees I am different nationality (7)
I believe the answer is:
siamese
'nationality' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'sees i am different' is the wordplay.
'different' indicates an anagram.
'sees'+'i'+'am'='seesiam'
'seesiam' with letters rearranged gives 'SIAMESE'.
Can you help me to learn more?
(Other definitions for siamese that I've seen before include "Cat - Thai?" , "Pugnacious aquarium species -- shagginess, if I'm thief (anag)" , "like a cat" , "Pale breed of cat" , "Cat with slanting blue eyes and pale fur with darker points" .)