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You may know it, or know it to some extent,

but here it is anyway:

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Perspicuous  (adj.) or

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Perspicuity  (n)

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For more use the DOOR.

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[MORE].

   perspicuous — (Acc. to the OED, this is called a “formal adjective.”)  It refers to an account or representation of something that is clearly expressed or represented or is lucid.  Ex.: His account was simpler or provided a more perspicuous explanation than his rivals.

[In Scrabble, think of having to the chagrin of having to unscramble or assemble something from “eiouussppr”!]

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   perspicuity — (n)  the making of an idea clear.  Ex. Ralph was capable of thinking deep thoughts, but for perspicuity in sharing them he was ungifted.  [Example from ADS  : ) ]

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   There’s also perspicuously, but let’s not go there…