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  1. Short version:

    _encloseme is added to a post when it’s published. The wp-cron process should get scheduled shortly thereafter to process the post to look for enclosures.

    In other words, it cleans them up normally later. Nothing to worry about.

    Full explanation:

    “Enclosures” are links in a post to something like an audio or video file. WordPress finds these based on the MIME type of the files being linked to, then saves extra metadata about them. This metadata is used in the RSS feeds, to create special tags to connect these files to the post.

    This is how podcasts work, for example. If you put a link to an MP3 in a post, then an enclosure will be created for that link, and the feed will have the enclosure, and podcast readers like iTunes can then use that to be able to download the MP3 directly from the RSS feed.

    _encloseme is just special metadata saying that the post hasn’t been processed by the enclosure process yet. When you create or update a published post, that gets auto-added so that the post will be processed by the enclosure creator.