The most common and most likely answer to this crossword clue is the 11 letter word ABBREVIATED
I've seen this crossword clue in The Times
A
B
B
R
E
V
I
A
T
E
D
More clues leading to the result ABBREVIATED
Buddy explains!

The straight part
We know that "in short" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in short = abbreviated.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 ABBREVIATED mean?
ABBREVIATED verb- To shorten by omitting parts or details.
- To speak or write in a brief manner.
- To make shorter; to shorten (in time); to abridge; to shorten by ending sooner than planned.
- To reduce a word or phrase by means of contraction or omission to a shorter recognizable form.
- To reduce to lower terms, as a fraction.
- Shortened; made briefer.
- Relatively short; shorter than normal, or compared to others.
- Scanty, as in clothing.