Crossword Genius

Definitely the result of an imprecise bisection (7)

Ross

I believe the answer is:

nothalf

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'definitely the result of' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'imprecise bisection' is the wordplay.
'imprecise' becomes 'not' (I can't justify this - if you can you should believe this answer much more).
'bisection' becomes 'half' (I've seen this in another clue).
'not'+'half'='NOTHALF'

'an' is the link.

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