Crossword Genius

What the chap dropped in the cap (5)


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'cap' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
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(Other definitions for aitch that I've seen before include "first bit of hymn?" , "Eighth letter of the English alphabet" , "the start of hives?" , "that I will immediately succeed" , "bone" .)

I've seen this clue in the Evening Standard.
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