Crossword Genius

Collapse, not being hit (4)

Ross

I believe the answer is:

flop

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

I believe this clue is a quadruple definition!!

'collapse' is the first definition.
(I know that collapse can be written as flop)

'not' is the second definition.
Both the definition and answer are adverbs. Maybe they are linked in a way I don't understand?

'being' is the third definition.
(flop is a kind of being)

'hit' is the fourth definition.
(thesaurus)

Can you help me to learn more?

(Other definitions for flop that I've seen before include "crash" , "Failure - loll" , "Utter failure" , "Complete failure" , "Dud - bomb" .)

I've seen this clue in the Evening Standard.
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