Bathing suit -- big kind -- is missing bottoms (6)

I believe the answer is:

bikini

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'bathing suit' is the definition.
(bikini is a kind of bathing suit)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for bikini that I've seen before include "Pacific atoll, used for US nuclear weapons tests" , "Kind of swimsuit" , "Infamous atoll" , "Minuscule bathing costume for woman" , "tests were carried out here" .)

I've seen this clue in The Telegraph.

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