Crossword Genius

Plenty of hard biscuit aboard ship! (6)

Ross

I believe the answer is:

stacks

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'plenty' is the definition.
(thesaurus)

'hard biscuit aboard ship' is the wordplay.
'hard biscuit' becomes 'tack' (I can't explain this - if you can you should give a lot more credence to this answer).
'aboard' is an insertion indicator.
'ship' becomes 'ss'.
'tack' placed inside 'ss' is 'STACKS'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for stacks that I've seen before include "A lot (of hay?)" , "Large tall chimneys" , "Orderly heaps as of hay" , "Orderly piles or heaps" , "Ricks" .)

I've seen this clue in the Evening Standard.
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