Model raunchier for World War II fighter (9)
I believe the answer is:
hurricane
'world war ii fighter' is the definition.
(fighter plane)
'model raunchier' is the wordplay.
'model' indicates an anagram (letters must be modelled into a new form ).
'raunchier' is an anagram of 'HURRICANE'.
'for' is the link.
(Other definitions for hurricane that I've seen before include "Severe tropical cyclone" , "Caribbean cyclone" , "Plane once" , "Tropical cyclone - WWII fighter" , "Storm with violent wind, common in Florida" .)