Crossword Genius

Barker, for instance, has 'appeal' (3)

Ross

I believe the answer is:

sue

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

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for sue that I've seen before include "Take proceedings against (a person)" , "Litigious girl" , "- - Barker, 19 star" , "Bring a legal action" , "Seek damages" .)

I've seen this clue in the Evening Standard.
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