Army doctor on American ship also known as Balkan Dish (8)
I believe the answer is:
moussaka
'balkan dish' is the definition.
'moussaka' can be an answer for 'dish' (moussaka is a kind of dish). I am not certain of the 'balkan' bit.
'army doctor on american ship also known as' is the wordplay.
'army doctor' becomes 'mo' (medical officer).
'on' means one lot of letters go next to another.
'american ship' becomes 'USS' (United States Ship, prefix used in US ship names).
'also known as' becomes 'a.k.a.' (synonyms).
'mo'+'uss'+'aka'='MOUSSAKA'
Can you help me to learn more?
(Other definitions for moussaka that I've seen before include "Balkan dish of meat, aubergines, tomatoes and cheese" , "Dish of minced lamb with aubergines in a white sauce" , "Casserole of aubergine and ground lamb" , "Greek dish of lamb and aubergine" , "a Greek speciality" .)