What does the cryptic crossword clue "US island has got it in the essence of tour (4)" mean?

The wordplay uses a container (one word inside another). AH (synonym="“got it!”") in OU (synonym="r") = OAHU The answer is OAHU.

US island has got it in the essence of tour (4)

Guardian Cryptic #29538 | 21 Across | 2024-11-12 flower