Crossword Genius

A sign that visitors aren't welcome (4,3)

Ross

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2,5 2,8

4,3

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'welcome' is the definition.
Although both the answer and definition are verbs in their base form, I cannot see how one could define the other.

I cannot understand how the rest of the clue works.

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(Other definitions for keep out that I've seen before include "warning note to trespassers?" , "sign of an exclusive establishment" , "No entry!" , "notice to trespassers?" , "Don't trespass" .)

I've seen this clue in The Irish News.
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