Certain to miss holiday handout on island (3)

I believe the answer is:

lei

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'holiday handout on island' is the definition.
(leis are given out in Hawaii)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for lei that I've seen before include "Garland of flowers, may accompany 5 Down" , "Hawaiian wreath" , "Flower garland of Hawaii" , "Hawaiin flower garland" , "Bloomers on line" .)

I've seen this clue in The Guardian.

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