The most common and most likely answer to this crossword clue is the 10 letter word DESCENDANT
I've seen this crossword clue in The Guardian
D
E
S
C
E
N
D
A
N
T
More clues leading to the result DESCENDANT
- Part of a line of harmonic accompaniment about to stop
- Issue notes for treble tackling finale
- One objective of tree maintenance
- Dances tend to be moved one further down the line
- Later family member finds insect beside sink
- ‘Offspring‘ providing accompaniment around finale
- C to move down with social worker
Buddy explains!

The straight part
We know that "one further down the line" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one further down the line = descendant.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 DESCENDANT mean?
DESCENDANT noun- One who is the progeny of a specified person, at any distance of time or through any number of generations.
- A thing that derives directly from a given precursor or source.
- A later evolutionary type.
- A language that is descended from another.
- A word or form in one language that is descended from a counterpart in an ancestor language.
- Descending from a biological ancestor.
- Proceeding from a figurative ancestor or source.