The most common and most likely answer to this crossword clue is the 9 letter word ZILLIONTH
I've seen this crossword clue in Financial Times
Z
I
L
L
I
O
N
T
H
More clues leading to the result ZILLIONTH
Buddy explains!

The straight part
We know that "one coming after many others" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one coming after many others = zillionth.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 ZILLIONTH mean?
ZILLIONTH noun- The person or thing in the zillionth position.
- One of a zillion equal parts of a whole.
- The ordinal form of the number zillion.