Wonderful to see Greek dine (5)
I believe the answer is:
great
'wonderful' is the definition.
(I've seen this before)
'greek dine' is the wordplay.
'greek' becomes 'gr' (abbreviation for Greek).
'dine' becomes 'eat' (I've seen this before).
'gr'+'eat'='GREAT'
'to see' acts as a link.
(Other definitions for great that I've seen before include "Storage container" , "Grand" , "The Plough" , "Marvellous; big" , "Extensive; excellent" .)