Crossword Genius

Figure of 'ostility, say (5)

Ross

I believe the answer is:

eight

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'figure' is the definition.
(I've seen this in other clues)

I cannot understand how the rest of the clue works.

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(Other definitions for eight that I've seen before include "1,001 - 993" , "Cube of two" , "Rowing boat crew" , "One over this for drunkeness" , "Number (with pieces?)" .)

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