To find Clay's hourly pay, you can divide the total amount he was paid by the number of hours he worked.
Clay was paid $42 for 5 hours of babysitting, so the calculation is:
\[ \text{Hourly pay} = \frac{\text{Total pay}}{\text{Number of hours}} = \frac{42}{5} = 8.4 \]
Thus, Clay's hourly pay is $8.40.