Minerals from forest (4)

I believe the answer is:

ores

'minerals' is the definition.
(ore is a kind of mineral)

'from forest' is the wordplay.
'from' indicates the answer is hidden within the clue.
'ORES' is hidden in the letters of 'forest'.

(Other definitions for ores that I've seen before include "Rocks or minerals containing metals" , "Mineral deposits" , "Mined minerals" , "Sources of metal" , "Metal-bearing minerals" .)

I've seen this clue in The Mirror.

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