Mistakenly download – it might contain old chestnuts (8)

I believe the answer is:

woodland

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'it might contain old chestnuts' is the definition.
The definition suggests a singular noun which matches the answer.

'mistakenly download' is the wordplay.
'mistakenly' is an anagram indicator.
'download' with letters rearranged gives 'WOODLAND'.

Can you help me to learn more?

(Other definitions for woodland that I've seen before include "deal here maybe?" , "Forested area" , "Forest" , "sylvan scene" , "scene in nature" .)

I've seen this clue in The Guardian.

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