The most common and most likely answer to this crossword clue is the 9 letter word THUMBNAIL
I've seen this crossword clue in Independent
T
H
U
M
B
N
A
I
L
More clues leading to the result THUMBNAIL
- Hitch? Then fix web image
- Sample of photo is a handy feature
- Sort of sketch album
- It’s extremely handy for this sort of sketch
- Quick sketch you don’t want going under the hammer?
- Particular sketch intensively read by Brad, say
- Sketch part of dog devouring bone oddly with much activity
- Digital sketch?
- Small image of wretched lamb in hut
- Gutless Rakshasa sacrificed until Brahma created miniature
Buddy explains!
The straight part
We know that "Quick sketch/you don’t want going under the hammer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case quick sketch/you don’t want going under the hammer = thumbnail.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 THUMBNAIL mean?
THUMBNAIL noun- The fingernail on the thumb.
- A rough sketch (e.g., the size of one's thumbnail).
- A small picture, used as a compact representation of a larger image.
- To describe concisely.
- To create a smaller representation of (a larger image).