Insist on having things just right (5)

I believe the answer is:

exact

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'insist on' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for exact that I've seen before include "Not approximate; inflict (revenge) on someone" , "Absolutely right" , "Absolutely accurate or correct" , "Spot on, precise" , "Precisely accurate" .)

I've seen this clue in The Globe and Mail.

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