Letter from Greece needs some interpretation (3)
I believe the answer is:
eta
'letter from greece' is the definition.
(letter from the Greek alphabet)
'some interpretation' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'ETA' can be found hidden inside 'interpretation'.
'needs' acts as a link.
(Other definitions for eta that I've seen before include "Letter of Greek alphabet" , "Greek H" , "Basque separatist movement" , "Greek letter E; estimated time of arrival (abbr.)" , "letter from Greece?" .)