Ship's biscuit (8)
'ship's biscuit' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for hardtack that I've seen before include "Former sailor's biscuit" , "Sailors' dry rations" , "Unsalted biscuit, once a ship's staple" .)
I've seen this clue in The Independent.
I've seen this clue in The Sunday Times.
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