The most common and most likely answer to this crossword clue is the 7 letter word GELATIN
I've seen this crossword clue in The Guardian
G
E
L
A
T
I
N
More clues leading to the result GELATIN
- Edible substance to take shape, a preserve
- On turning, whisk ain’t making jelly
- Setter with genital rash
- Jelly eating out requires plate
- Setter‘s genital abnormality
- Little egg a member served up – something gluey
- Colourless, odourless, tasteless ingredient turning up in linguini taleggio?
- Posh girl has a can of glue
- New tagline for jelly
- For starters, love eating fresh jelly
Buddy explains!

The straight part
We know that "Edible substance" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case edible substance = gelatin.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does GELATIN mean?
GELATIN noun- A protein derived through partial hydrolysis of the collagen extracted from animal skin, bones, cartilage, ligaments, etc.
- An edible jelly made from this material.
- A thin, translucent membrane used as a filter for photography or for theatrical lighting effects.