'Ballpark prices get me!' I stressed (9)

I believe the answer is:

imprecise

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But I can't explain it at all! Could you help me understand?

(Other definitions for imprecise that I've seen before include "Lacking exactness" , "not quite right" , "Inexact" , "Not exact or clearly stated" , "Rough" .)

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

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