The most common and most likely answer to this crossword clue is the 7 letter word LINEAGE
I've seen this crossword clue in Financial Times
L
I
N
E
A
G
E
More clues leading to the result LINEAGE
- Descent made by majority at end of rope
- Exotic eagle in descent
- Large eagle dropping left, beyond in descent
- Amount of writing covering European leader’s ancestry
- Descent with rope possibly taking a long time
- Fantastic eagle in descent
- Eagle in clumsy descent
- Descent described by eagle?
- Riotous glee in a family
- Pedigree Pomeranian’s tail interrupting story time
Buddy explains!

The straight part
We know that "descent" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case descent = lineage.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 LINEAGE mean?
LINEAGE noun- Descent in a line from a common progenitor; progeny; descending line of offspring or ascending line of parentage.
- A number of lines of text in a column.