Stomach bold new reform in a ruined state (6-4)

I believe the answer is:

tumble-down

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'a ruined state' is the definition.
Both the answer and definition are adjectives. Perhaps you can see an association between them that I can't see?

'stomach bold new reform' is the wordplay.
'stomach' becomes 'tum' (synonyms).
'reform' indicates anagramming the letters (letters in a new form).
'bold'+'new'='boldnew'
'boldnew' with letters rearranged gives 'bledown'.
'tum'+'bledown'='TUMBLE-DOWN'

'in' is the link.

Can you help me to learn more?

(Other definitions for tumble-down that I've seen before include "Ramshackle" , "Dilapidated" .)

I've seen this clue in the Sydney Morning Herald.

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