Second rock from the sun (5)
I believe the answer is:
venus
'second rock from the sun' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for venus that I've seen before include "not really a star" , "Roman goddess of love" , "Heavenly body" , "Solar system planet" , "Roman counterpart of Aphrodite" .)