I probably would have noticed that if I wasn't (supposed to be) working at the same time! In the meantime, this has reminded me of one that I've wanted to clue for a while:
This clue might be: "500. Precedes solid containing volume of mute's heart"

10 letters, btw.

[Blob] Division?

Re your dis-cushion: Can 'dis' be used as a noun as well as a verb?

[MF] BLOB, I think, hehehe

Here's a clue I saw in an Acorn User crossword in the early 90s, which I've always remembered. It's a long way short of perfect, but still, I liked it... Yalp? (8)

[Darren]PLAYBACK seems too obvious. [MF] Sorry - meant to say - thanks for help earlier

Although are you sure you mean ultimately? I once saw this clued as This is it!

Like this? (4-11)
[rab] well, yes, I was aware that was a flaw; I was hoping to get away with a loose sense of ultimate = end. And I want yours to be DEFINITION, but I can't figure out why.

Can't get your questioned simile just now, but I'm afraid your not quite right with mine just yet. It's somehow more in the vein of your magnum opus.