Crossword Genius

Form of soil from which to get fodder? (4)

Ross

I believe the answer is:

silo

I'm a little stuck... Click here to teach me more about this clue!

'form of soil from which to get fodder?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'form of soil' is the wordplay.
'form of' is an anagram indicator (the letters need to be in another 'form').
'soil' is an anagram of 'SILO'.

Can you help me to learn more?

(Other definitions for silo that I've seen before include "Store for grain or fodder" , "Farm store; soil (anag.)" , "Storage unit for animal feed" , "Large container for oils" , "Storage pit, tower" .)

I've seen this clue in the Evening Standard.
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