Some corn, though wanting filling loaf for a snack (5-3)

I believe the answer is:

earth-nut

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'a snack' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'some corn though wanting filling loaf' is the wordplay.
'some corn' becomes 'ear' (an ear is a piece of corn).
'though wanting filling' becomes 'th' (I can't explain this - if you can you should believe this answer much more).
'loaf' becomes 'nut' (I've seen this in other clues).
'ear'+'th'+'nut'='EARTH-NUT'

'for' is the link.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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