Dithering's not about returning possession (6)

I believe the answer is:

having

'dithering's' is the definition.
The answer and definition can be both related to bodily activities as well as being present participle verbs.
Maybe there's a link between them I don't understand?

I can't explain the rest of the clue.

(Another definition for having that I've seen is " Possessing, owning".)

I've seen this clue in The Independent.

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