Being painful, it's not exactly rapture! (7)

I believe the answer is:

rupture

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'being' is the definition.
The answer and definition can be both states of affairs as well as being singular nouns.
Maybe you can see a link between them that I don't see?

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

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(Other definitions for rupture that I've seen before include "Burst suddenly" , "Split" , "Ecstasy" , "State of being torn or burst open" , "Breach, severance" .)

I've seen this clue in the Evening Standard.

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