Come about

ARISE

Think of what the sun does at dawn or a problem that suddenly emerges.

"Come about" is a phrase that can mean "to happen" or "to occur," which directly points to the answer "ARISE." The wordplay here is straightforward—both phrases suggest something emerging or taking place. In crosswords, "come about" often hints at synonyms for "happen," and "arise" fits perfectly as a concise, four-letter match. No tricks, just a clean definition.