Crossword Genius

Of an unbreakable alibi, perhaps (8)

Ross

I believe the answer is:

ironclad

(Other definitions for ironclad that I've seen before include "monitor, for example" , "19th-century warship" , "Old cairn with metal protection" , "Old armoured warship" , "Unassailable" .)

I've seen this clue in the Sydney Morning Herald.
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