Illustrates lost trail in Donnybrook (6)

I believe the answer is:

tussle

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'donnybrook' is the definition.
(thesaurus)

I don't understand the rest of the clue.

(Other definitions for tussle that I've seen before include "Go at it" , "Wrestle, scuffle" , "Vigorous struggle or scuffle" , "'Physical fight, struggle (6)'" , "A struggle or conflict" .)

I've seen this clue in the Irish Times.

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