To rotate a point (x, y) clockwise about the origin by 90 degrees, we can use the following transformation:
\[ (x, y) \rightarrow (y, -x) \]
For the point (-4, -6):
- Take y = -6 and -x = 4.
- Therefore, the new point is (-6, 4).
Thus, the answer is:
\((-6, 4)\)