Crossword Genius

Continued existence of frail feet, sadly (9)

Ross

I believe the answer is:

afterlife

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'continued existence' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'frail feet sadly' is the wordplay.
'sadly' is an anagram indicator.
'frail'+'feet'='frailfeet'
'frailfeet' with letters rearranged gives 'AFTERLIFE'.

'of' is the link.

Can you help me to learn more?

(Other definitions for afterlife that I've seen before include "Post-death existence" , "Existence following death" , "Hoped-for future" , "paradise" , "Existence beyond the grave" .)

I've seen this clue in The Mirror.
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