Crack and dent the result of crash (5,10)

I believe the answer is:

great depression

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'result of crash' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'crack and dent' is the wordplay.
'crack' becomes 'great' (I've seen this in another clue).
'and' says to put letters next to each other.
'dent' becomes 'depression' (synonyms).
'great'+'depression'='GREAT DEPRESSION'

'the' is the link.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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