Entrance is broken; it doesn't last long (10)

I believe the answer is:

transience

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'it doesn't last long' is the definition.
The definition suggests a singular noun which matches the answer.

'entrance is broken' is the wordplay.
'broken' is an anagram indicator.
'entrance'+'is'='entranceis'
'entranceis' with letters rearranged gives 'TRANSIENCE'.

Can you help me to learn more?

(Other definitions for transience that I've seen before include "Ephemerality" , "Impermanence" .)

I've seen this clue in The Globe and Mail.

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