Crossword Genius

Biscuits etc seen aboard ship a good deal (6)

Ross

I believe the answer is:

stacks

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'good deal' is the definition.
(thesaurus)

I don't understand the rest of the clue.

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(Other definitions for stacks that I've seen before include "Ricks" , "Orderly heaps as of hay" , "Tons" , "bags?" , "A lot (of hay?)" .)

I've seen this clue in The Independent.
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