The most common and most likely answer to this crossword clue is the 12 letter word MASTERSTROKE
I've seen this crossword clue in The Times
M
A
S
T
E
R
S
T
R
O
K
E
More clues leading to the result MASTERSTROKE
- Learn to crawl? Quite an achievement!
- Tour de force from principal oarsman
- Achievement demonstrating skill of expert oarsman
- Term OK to adapt when accepting flowers for exceptional performance
- Clever idea some linked with Star Trek broadcast
- Very clever move made by original rower
- Great performance — one of the best at school?
- Outstanding piece of strategy shown by expert oarsman
- Original/well-timed act
Buddy explains!
The straight part
We know that "Quite an achievement" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case quite an achievement = masterstroke.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 MASTERSTROKE mean?
MASTERSTROKE noun- An action which demonstrates great skill or artistry.