So, Irouleguy is in the driving seat for the next lap.
It is not/does not:
The eye of the little yellow god
The title of a book
A tool with wooden handle and metal business end
Have anything to do with grass
Not found underground
Part of fokelore of a particlar people
A weapon
Harry Potter's staff - but the right line of thinking
Contain a gem stone
The Mona Lisa smile
Have connection with Lord of the Rings
From a television series
Have magical properties
It is/does:
Have a very faint connection with Ireland but this would be misleading
Have punctuation in it
Fictional
Wood in the vegetable part
Contain a possessive apostrophe
Have metal fixings of some sort - but there's (more important) mineral parts as well
Pre-date 1950
Did you know that Mushrooms have over 36,000 sexes! Unlike us mere mortals who have only the 2 [and a bit, arguably]. No wonder they proliferate.
Anyway, enough of this self-disclosure. It's high time we had ...
ABSTRACT ANIMAL
hmmm - crossdressing trannies - don't go down that path. If I was vague on the gender issue, there might be a good reason. It may help to think laterally. Don't worry about the Abstract part just yet either.
Now for the Abstract bit :-)
As for the other replies - you are all correct so I have to be fair and give it to the person who mentioned the word 'Brand' [mainly because I had in mind the phrase The Beckham Brand when I began].
Well done Irouléguy for getting there just before flerdle [with whom I agree wholeheartedly on the annoyance factor]
Commiseration thingies to INJ for also being correct.
*hands over to Irouléguy*
Summary:
It is: a single, existing, permanent, manufactured metal object in the U.K., bigger than a phone box and smaller than a shipping container, big enough to get inside (laughter), at least as wide as tall, um er briefly associated with a TV series, and without moving parts.
It is not: a form of transport, or any of the specific things mentioned so far.