Crossword Genius

Coming out of their shells, Brad and Lucy not just loud (7)

Ross

I believe the answer is:

raucous

'loud' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

(Other definitions for raucous that I've seen before include "Loud and harsh-sounding" , "harshly loud" , "Shrill - strident" , "Rowdy - strident" , "Unpleasantly loud and harsh" .)

I've seen this clue in The Times.
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