Crossword Genius

Having passed over, going back to again (8)

Ross

I believe the answer is:

haunting

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'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.

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(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" .)

I've seen this clue in the Evening Standard.
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