The most common and most likely answer to this crossword clue is the 7 letter word ELASTIN
I've seen this crossword clue in The Guardian
E
L
A
S
T
I
N
More clues leading to the result ELASTIN
- Protein and energy supplied to number eleven?
- Energy and most of remaining protein
- Berliner's one to consume ultimate protein
- Protein a German has ingested finally
- A German consumes final sort of protein
- Protein in e.g. tendons entails flexing
- Bodily substance of England’s opener and No. 11?
- Protein drink’s repellent small container
- 11 Kind of protein — it’s back in style
- One finally has almost enduring protein
Buddy explains!
The straight part
We know that "sort of protein" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sort of protein = elastin.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 ELASTIN mean?
ELASTIN noun- A protein, similar to collagen, found in connective tissue, that has elastic properties.