Crossword Genius

He shows that one letter's not the whole alphabet (5)

Ross

I believe the answer is:

ralph

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'he' is the definition.

I don't understand the rest of the clue.

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(Other definitions for ralph that I've seen before include "N Waldo Emerson, nineteenth century US poet" , "Chap" , "___ Fiennes, English actor, b. 1962" , "Boy's name" , "Fellow's name" .)

I've seen this clue in the Evening Standard.
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