Crossword Genius

Small piece of land isn't available? (5)

Ross

I believe the answer is:

islet

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

'small piece of land' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for islet that I've seen before include "detached territories?" , "Eyot, holm, inch" , "Ait or key" , "Very small area surrounded by water" , "Piece of land in e.g. river" .)

I've seen this clue in The Times.
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