Crossword Genius

Pursue a misguided line of thought (4,2,3,5,4)

Ross

I believe the answer is:

bark up the wrong tree

(Other definitions for bark up the wrong tree that I've seen before include "misled?" , "Proceed under a misapprehension" , "How a boxer may treat an elder" .)

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