Oil's obtainable from the earth (4)

I believe the answer is:

soil

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'the earth' is the definition.
(earth can mean soil or dirt)

'oil's obtainable' is the wordplay.
'oil's' can be anagrammed to 'SOIL'.
However, I am not sure how the anagram is indicated.

'from' is the link.

Can you help me to learn more?

(Other definitions for soil that I've seen before include "Earth for growing" , "refuse" , "Top layer of the surface of the earth" , "In which plants grow" , "Earth; stain" .)

I've seen this clue in the Evening Standard.

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