Casually treat husband after i.e. pinching guy’s bottom (3,4)

I believe the answer is:

toy with

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'bottom' is the definition.
The definition and answer can be both related to thinking as well as being verbs in their base form.
Maybe there's a link between them I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for toy with that I've seen is " Tease".)

I've seen this clue in The Guardian.

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