Crossword Genius

Garish obscure start is missing (4)

Ross

I believe the answer is:

loud

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'garish' is the definition.
(synonyms)

I don't understand the remainder of the clue.

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(Other definitions for loud that I've seen before include "At high volume" , "Forte" , "vulgar" , "booming" , "Deafening" .)

I've seen this clue in The Mirror.
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