A bit of love before sunrise would presumably suit her (5)
I believe the answer is:
venus
'her' is the definition.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for venus that I've seen before include "Morning star" , "our Neighbour" , "Roman counterpart of Aphrodite" , "Next planet in" , "One of the planets" .)