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Firm's final hint on recession (7)

Ross

I believe the answer is:

medulla

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This could be a double definition.

'firm's final' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'hint on recession' is the second definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

Can you help me to learn more?

(Other definitions for medulla that I've seen before include "centre of organ" , "pith" , "Innards of organ" , "Lower part of the brain" , "bit of brain" .)

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