The most common and most likely answer to this crossword clue is the 9 letter word CHAPERONE
I've seen this crossword clue in The Guardian
C
H
A
P
E
R
O
N
E
More clues leading to the result CHAPERONE
- Endless cod for each individual and my charges are small
- Drink for each individual child-minder?
- Man - one protecting monarch i.e. minder
- Early text dismissing model of Ford Escort
- Minder — Terry initially absent from start of story
- Timeless opening of book portraying young girl’s companion?
- Fellow, bird … nothing to stop them? She might have done
- Man with leg over the Queen, European escort?
- Guardian could be no cheaper
- With investment of time, this escort could start a book
Buddy explains!

The straight part
We know that "escort" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case escort = chaperone.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 CHAPERONE mean?
CHAPERONE noun- An older person who accompanies other younger people to ensure the propriety of their behaviour, often an older woman accompanying a young woman.
- A protein that assists the non-covalent folding/unfolding and the assembly/disassembly of other macromolecular structures, but does not occur in these structures when the latter are performing their normal biological functions.
- To act as a chaperone.