To find the coordinates of the endpoints of the line segment \((0, -3)\) and \((0, -7)\) when rotated clockwise by \(90^\circ\), we will apply the transformation for rotation.
The general rule for rotating a point \((x, y)\) by \(90^\circ\) clockwise around the origin is given by: \[ (x, y) \rightarrow (y, -x) \]
Now, we will apply this transformation to both endpoints of the segment.
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For the point \((0, -3)\): \[ (0, -3) \rightarrow (-3, 0) \]
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For the point \((0, -7)\): \[ (0, -7) \rightarrow (-7, 0) \]
So after the rotation, the new endpoints of the line segment are \((-3, 0)\) and \((-7, 0)\).
Therefore, one of the endpoints of the rotated segment is \((-3, 0)\).
Hence, the answer is: \[ \boxed{(-3, 0)} \]