Crossword Genius

Small island has tenant! (5)

Ross

I believe the answer is:

islet

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This might be a double definition.

'small island' is the first definition.
(I've seen this before)

'tenant' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'has' is the link.

Can you help me to learn more?

(Other definitions for islet that I've seen before include "Tiles to make a small island" , "Eyot, holm, inch" , "small key?" , "Eyot, key" , "Cay, for example" .)

I've seen this clue in The Sun.
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