Second-largest continent (6)
I believe the answer is:
africa
'second-largest continent' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for africa that I've seen before include "Always something new from it (Pliny)" , "The CIA and RAF are found on the continent" , "If a car could go to this continent" , "Continent S. of Europe" , "Large land mass" .)