Definitely the result of an imprecise bisection (7)

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 it can be defined by this definition.

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

'an' acts as a link.

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