Perhaps ore is turned up on wearing away of the soil (7)
I believe the answer is:
erosion
'wearing away of the soil' is the definition.
I can't tell whether this definition defines the answer.
'perhaps ore is turned up on' is the wordplay.
'perhaps' indicates anagramming the letters.
'turned up' shows that the letters should be reversed in order.
'is' in reverse letter order is 'si'.
'ore' anagrammed gives 'ero'.
'ero'+'si'+'on'='EROSION'
Can you help me to learn more?
(Other definitions for erosion that I've seen before include "The wearing away by water or weather" , "Action of wearing away" , "The wearing away as by wind or water" , "Deterioration of soil etc" , "The gradual wearing away by weather" .)