Serving a highball (7)

I believe the answer is:

lobbing

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'serving a highball' is the definition.
The definition and answer can be both to do with contact as well as being present participle verbs.
Maybe you can see a link between them that I don't see?

This is the entire clue.

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(Another definition for lobbing that I've seen is " Throwing up in the air".)

I've seen this clue in The Globe and Mail.

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