The most common and most likely answer to this crossword clue is the 6 letter word PRECIS
I've seen this crossword clue in The Daily Telegraph
P
R
E
C
I
S
More clues leading to the result PRECIS
- Summary that’s almost exact
- Summary that's accurate except for the last bit
- Mostly accurate summary
- Almost exact summary
- Summary is not quite accurate
- Copper is coming round about to get summary
- Sketchy summary that’s not entirely accurate
- Summary not quite correct
- Summary is not entirely accurate
- Abstract price adjusted before start of sale
Buddy explains!

The straight part
We know that "Sketchy summary" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sketchy summary = precis.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 PRECIS mean?
PRECIS noun- A summary or brief: a concise or abridged statement or view.
- To write a précis of a work; to summarise, abridge