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)