Drink sprayed initially in part of eye (7)
I believe the answer is:
retsina
'drink' is the definition.
(retsina is a kind of drink)
'sprayed initially in part of eye' is the wordplay.
'sprayed initially' becomes 's' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'part of eye' becomes 'retina' ('retina' is part of 'eye').
's' inserted within 'retina' is 'RETSINA'.
Can you help me to learn more?
(Other definitions for retsina that I've seen before include "S European wine" , "Greek white wine flavoured with resin" , "Flavoured Greek white wine - nastier brand" , "Oily-tasting Greek white wine" , "Greek wine - nastier sort" .)