Online poster wife leaves in lurch (6)

I believe the answer is:

teeter

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'lurch' is the definition.
(thesaurus)

I don't understand the rest of the clue.

(Other definitions for teeter that I've seen before include "Seesaw, totter" , "Sway, as if about to fall" , "Sway back and forth on the edge" , "Move with little assurance" , "Rock precariously on the edge" .)

I've seen this clue in The Sun.

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