Of Cancer or Capricorn (8)
I believe the answer is:
tropical
'of cancer or capricorn' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tropical that I've seen before include "Hot and humid type of weather" , "Middle-earth" , "Relating to hot and humid parts" , "it could be too hot" , "Of regions north and south of the Equator" .)