Per this official statement from Focal, YES they limited volume in favor of clarity for Utopia, Elear, and Elex (no direct mention of Clear):
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Dear all,
As already mentionned several times on Head-Fi, the issue described is actually not a quality issue.
Indeed, we have made a clear design choice on Elear (and by consequence Elex) and Utopia. Our headphones have been designed to favor the respect of the dynamic contained within the audio signal versus dynamic compression that would offer a higher SPL capability but less respect of the original audio signal. To cut a long story short, the choice was audio quality oriented rather than SPL oriented. This allows our products to work with full performances until the mechanical clipping is activated. This means that you jump directly from a very low distortion to a sound which could be heard as rattling / cracking noise. On very special tracks with only very low frequencies at very high level, you can thus hear some noises - as you will do on classic loudspeakers.
If we change your pair of headphones, the new one will be designed similarly and it will also have a kind of cracking sound when you will be listening to music with high volume and a fair amount of bass.
The only solution we can recommend you is therefore to listen to your headphones at a lower volume.
Thank you for your understanding,
Best regards,
Marine, Community Manager Focal