Curved down like an eagle's beak (8)
I believe the answer is:
aquiline
'curved down like an eagle's beak' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for aquiline that I've seen before include "Looking like eagle's beak, say nose" , "(Of a nose) curved" , "Sort of beak" , "Curved down like an eagle's beak" , "Like an eagle" .)