Crossword Genius

Congratulatory gesture one way to make friends? (8)

Ross

I believe the answer is:

backslap

I'm a little stuck... Click here to teach me more about this clue!

'make friends?' is the definition.
The definition and answer can be both to do with social activities as well as being verbs in their base form.
Perhaps there's a link between them I don't understand?

I can't explain the remainder of the clue.

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I've seen this clue in The Times.
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