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Intel: If I'm not using the dedicated clock input pin, is it okay to leave it open?

board

In principle, if the dedicated clock input pin is not used, connect it to GND.
Please refer to the pinout file and device pin connection guidelines for the device you are designing for, and check the description of how to handle unused clock pins.

pinout file
 https://www.altera.co.jp/support/literature/lit-dp.html

DEVICE PIN CONNECTION GUIDELINES
 https://www.altera.co.jp/support/literature/lit-dpcg.html

The compilation report also contains instructions on how to proceed.

 
Please refer to the following materials as well.
Quartus II Getting Started Guide - Device Unused Pin States and Their Handling

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