MS Excel
If you need to remove only the formatting done in a range (numbers and formula typed there should not be removed), you must

From Edit menu choose Clear and then Formats
Double click the Format Painter and then press Esc key in keyboard
From Edit menu choose Delete
Click on Remove Formatting tool on Standard Toolbar

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MS Excel
A circular reference is

Always erroneous
Geometric modeling tool
A formula that either directly or indirectly depends on itself
A cell that points to a drawing object

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