It's the first riddle I've ever made up myself so hopefully it's not too vague, too hard or too easy.
Long long ago in a place by the sea
William the drunkard got down on one knee
"Please wife" he said. (With barely a slur)
"It's not my fault i'm late, it's all down to her!"
"T'was a witch in the hills." he invented wildly
"So you're not drunk at all?" she said mildly
"Just a nip on my way to get over the scare
She was 30 feet tall but clothed only in hair!
Her skin was dead white yet smooth as best silk,
And she threatened her blood would sour our milk!
She would entice kids away with sweet treats, if you please,
Which when bitten would launch the most terrible bees!"
"I've heard enough" said his wife. "I'll go get the men"
And so they all trooped uphill to the glen.
With pitchforks and torches and shouting aplenty,
All taken together were a mob over twenty.
And when they got there what did they see?
Nothing at all, but a _____________!
EDIT: Since no one has it yet, though very close, here's a pair of clues - and I apologise in advance for the poor rhyme style!
If a clue is something you need,
Then let us consider a seed.
There is some confusion,
(though it's an illusion),
On its crunch you don't want to feed.
If you can't get it from that one, here's another:
But if that clue's far too opaque,
Don't stress and get a headache.
In a roll like bread,
or sometimes even in cake!
Edit 2: One more clue from me:
This one's a miracle - according to many,
It clothed the first people not charging a penny,
Oft rich purple colour - but unlike a plum,
There's no fruit for you here but don't feel glum,
Its deliciously sweet and ready to eat,
A false fruit can sometimes be hard to beat!