Crossword Genius

Liable to show an upsurge in nepotism (4)

Ross

I believe the answer is:

open

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'liable' is the definition.
(thesaurus)

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(Other definitions for open that I've seen before include "Traditional room heater" , "Allowing access" , "with no clear favourite" , "golf contest" , "Not enclosed" .)

I've seen this clue in the Evening Standard.
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