Can a power surge cause amp to clip?

????

You heard a clipping sound, like the on/off switch being thrown very quickly?

OR

You have some device that says "I clipped X number of timed in the last number of hours".

Don't you have to be playing something to clip? The signal is going beyond and breaks the wave forum "Clipping" the Tops and Bottoms off the mountains and valleys. Paper tears, stuff breaks, smoke comes out of voice coils..

No idea what he is talking about.

If there was an audible sound heard from the speakers as a result of a power surge it’s very possible the amp clipped while making it.  If it did it could damage the speakers.   Check everything out.  Hopefully sounds same as prior and everything works.   

Don't you have to be playing something to clip?

Yes. The OP is most likely using the wrong terminology.

(Unless he plays music all night long).

You don’t need clipping for a power surge to cause damage to gear but it’s possible and perhaps even likely clipping occurred as a result if you heard a sound from the speakers as a result of a power surge.

The issue is the power surge.   Avoid those in any way possible like turning off and even unplugging gear during thunder storms.