核心问题
clean 除用作形容词外，亦可用作副词。不知它用作副词时与副词 cleanly 有无区别。
词典解答
clean 用作副词时,其语义是与 cleanly 不同的。请观察下面的实例:
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There! I clean forgot it. (Wells) 呀！我完全忘了。
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The bullet went clean through his shoulder. (ALD) 子弹穿透了他的肩膀。
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The thief got clean away... (EED) 那个小偷跑得无影无踪……
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He caught the ball cleanly. (ALD) 他干净利落地接住了那个球。
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This knife doesn't cut cleanly through the meat. (ALD) 这把刀切肉不利落。