Garland’s role in Stowaway (3)

I believe the answer is:

lei

I'm a little stuck... Click here to teach me more about this clue!

'garland's' is the definition.
(a lei is a garland of flowers)

'role in stowaway' is the wordplay.
'LEI' is hidden within the letters.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for lei that I've seen before include "neck decoration" , "ready in Romania" , "Hawaiin flower garland" , "Hawaiian garland of flowers" , "Floral decoration" .)

I've seen this clue in the Sydney Morning Herald.

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