What does the cryptic crossword clue "Certain to miss holiday handout on island (3)" mean?

The definition is "island". The wordplay uses a deletion. LEI (deletion) = LEI; definition: "handout on island" The answer is LEI.

Certain to miss holiday handout on island (3)

Guardian Cryptic #29018 | 11 Across | 2023-03-15 flower