Land in terrible rain (4)
I believe the answer is:
iran
'land' is the definition.
(Iran is an example)
'terrible rain' is the wordplay.
'terrible' indicates an anagram.
'rain' anagrammed gives 'IRAN'.
'in' acts as a link.
(Other definitions for iran that I've seen before include "Tehran's country" , "Middle East country" , "bombless state" , "oil supplier" , "Middle Eastern country" .)