Wine bringing hint of shakiness into part of eye (7)
I believe the answer is:
retsina
'wine' is the definition.
(type of Greek wine)
'hint of shakiness into part of eye' is the wordplay.
'hint of' indicates taking the first letters (the smallest possible amount of the word).
'into' is an insertion indicator.
'part of eye' becomes 'retina' (eyes have retinas).
The first letter of 'shakiness' is 's'.
's' inserted within 'retina' is 'RETSINA'.
'bringing' acts as a link.
(Other definitions for retsina that I've seen before include "Flavoured Greek white wine - nastier brand" , "Greek wine - nastier sort" , "Greek resin-flavoured wine" , "Nastier (anag) - white (or rose) wine" , "Type of Greek wine" .)