On which one may flop in a low dive (5)

I believe the answer is:

belly

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'dive' is the definition.
Although both the answer and definition are verbs in their base form, I don't understand how they can define each other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for belly that I've seen before include "Abdomen" , "Corporation" , "Tummy" , "Paunch" , "Stomach" .)

I've seen this clue in the Evening Standard.

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