Crossword Genius

Such laughter can hardly be a belly laugh! (6)

Ross

I believe the answer is:

hearty

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'laugh' is the definition.
(thesaurus)

I don't understand how the rest of the clue works.

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(Other definitions for hearty that I've seen before include "Stalwart" , "full of enthusiasm" , "backslapping everyone?" , "Warm, vigorous" , "Vigorously warm and friendly" .)

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