Greek looking for hard worker (7)
I believe the answer is:
grafter
'hard worker' is the definition.
(I've seen this before)
'greek looking' is the wordplay.
'greek' becomes 'gr'.
'looking' becomes 'after' (I've seen this in other clues**).
'gr'+'after'='GRAFTER'
'for' is the link.
(Other definitions for grafter that I've seen before include "One who works hard" , "Hard worker - corrupt operator" .)