Valuable items found no doubt during jolly ramble (8,5)

I believe the answer is:

treasure trove

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'ramble' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for treasure trove that I've seen before include "stash?" , "Hidden delights" , "lot of valuable things" , "Discovered valuables" , "asset to the government" .)

I've seen this clue in The Independent.

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