Moving the Clarity slider adjusts primarily mid-tones and does so by adding or reducing contrast without adding noise.

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Increasing Clarity to 30

Increasing Clarity improves the appearance of details in images that has an object that already has strong details but otherwise has hazy surroundings. Here is a photo with Clarity set to 0.

Now here is the same image with Clarity set to 30.

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Decreasing Clarity to -60

Lowering Clarity results in a softer focus effect that is effective in personal or intimate photography. Here is a photo with Clarity set to 0.

Here is the same image with Clarity set to -60 on the Tone Panel.

 

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Clarity Parameter in the Tone Panel