Normally I don't get many clicks, but today I have gotten 7 clicks (11.47% CTR) on a very unoptimized website. Is there any need to worry?
You say only 7 clicks. CTR could fluctuate wildly with that volume. And i can't say you need not worry either because may be those 7 clicks were done by same person, who knows. Try adlogger, it doesn't work well, but still..
This happens sometimes, and you should not to worry - adsense probably know well situations like that, so they know what to do with that. 11% seems to be to much a bit, but if this happens very rare, no problem - we can't control people browsing our sites in the way they want, even they click on every ad they see.
Normally nothing to worry about. I would check your stats on your host just to make sure they did not come from the same IP. If they did, I would keep an eye on it the next couple of days to make sure you are not a target of click bombing. It is most likely nothing to worry about but always a good idea to keep track.