Cryptic crossword clue
Jack ultimately has age and can nail constituent 7

The most common and most likely answer to this crossword clue is the 7 letter word KERATIN

I've seen this crossword clue in The Daily Telegraph
K
E
R
A
T
I
N

Buddy explains!

The straight part
We know that "nail constituent" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case nail constituent = keratin.
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 KERATIN mean?

KERATIN noun
  1. The protein of which hair and nails are composed.

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