Think of one cut that goes all the way through in a single movement, and the smooth edge it leaves behind. Nothing is torn, nothing is still joined by threads, nothing is left on the blade. From that edge you can reach everything this word does: a stick that snaps, a partnership that ends with nothing still in dispute, a fire that burns away without leaving smoke or ash. The adjective sits slightly apart — it is about a person or an animal who keeps things clean by habit, and even sounds different.
From the word’s history
The packet's source entries give both words as clean + -ly: the adverb from Old English clǣnlīċe, the adjective from Old English clǣnlīċ. English clean carries 'free of dirt' and also 'whole, with nothing extra left'; the adverb took mostly the second road.
資料上說這兩個字都是 clean 加 -ly：副詞來自古英語 clǣnlīċe，形容詞來自 clǣnlīċ。英文 clean 同時有「沒有髒東西」和「完整、不留多餘」兩面，副詞走的多半是後面那一條。
Wiktionary entries for cleanly (adjective and adverb), supplied in this packet: adjective from Old English clǣnlīċ, adverb from Old English clǣnlīċe, both clean + -ly.
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