Having passed over, going back to again (8)
I believe the answer is:
haunting
'having' is the definition.
Although both the answer and definition are present participle verbs, I cannot see how they can define each other.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for haunting that I've seen before include "Visiting as a ghost" , "pursuit of ghosts" , "Ghost visitation on ninth Aug" , "Frequenting a place, as a ghost might" , "Poignant, evocative" .)