I see little resemblance to clouds here:[ɬ]The superimposed tilde symbol ~ on the small letter L resembles some clouds and when it's taken away, it's no longer in darkness.
Take clan, clean, cleat, clot, clay, inclined as examples.
Yes, in some utterances, /l/, when fully devoiced, is realised as [ɬ].
That symbol, the 'belted' l', [ɬ] is the symbol for the voiceless alveolar lateral fricative that exists in Welsh, but not in the English of most speakers in England. The velarised alveolar lateral approximant or 'dark l', has the /l/ with the tilde: [ɫ].

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