There is precedent for this. In 2012, spotify said https://community.spotify.com/t5/Closed-Ideas/Explicit-Only-Edited-Only-Option/idi-p/401396 that in enabling a 'clean only' filter they would also be able to introduce an 'explicit only' idea. They didn't end up doing this...
Essentially there's nothing worse than having a spotify generated playlist which contains the occasional 'clean version' of a track, where half the song is missing due to being filtered out. There should be a toggle to remove the clean versions of tracks so we only see the official original version.
Updated on 2020-05-26
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