What does the cryptic crossword clue "Recognise one with all-consuming interests being upset (4)" mean?

The definition is "Recognise". The wordplay uses a reversal. WONK (reversal="‘one with all-consuming interests’") = KNOW; definition: "Recognise" The answer is KNOW.

Recognise one with all-consuming interests being upset (4)

Guardian Cryptic #28952 | 2 Down | 2022-12-28 flower

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