GCLID - Google Click ID
I do not use Google Ads but I have seen GCLID in my server logs.
What Google say:
"
Google Click ID (GCLID) is a parameter passed in the URL with ad clicks, to identify the campaign and other attributes
of the click associated with the ad for ad tracking and campaign attribution. In Google Ads, this is enabled by turning
on the auto-tagging setting. It’s required for Google Ads website conversion tracking and also used to link data between
Google Ads and Google Analytics.
It can also be used in conjunction with features like offline conversion tracking.
"
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tempusfugit.me.uk does not contain any advertising so the relevance of Google Ads is of less relevance.
However, GCLID has come to the attention of the webmaster as did FBCLID
