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<summary>Click for detailed spoiler explanation:</summary>
The answer is *ammo*.
The definition is *bullet*.
This is arrived at by:
Taking a (compass) point, in this case "*e*" (for East), out of the word *memo*, giving "*mmo*".
This is then put after the third letter of *draft*, which is an "*a*", to give the answer of "*ammo*".
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EDIT - looks like the spoiler thing ruins the formatting. It looks fine in the preview pane. I will raise a bug.
For reference the source of that post is :