The most common and most likely answer to this crossword clue is the 11 letter word SHOWSTOPPER
I've seen this crossword clue in The Daily Telegraph
S
H
O
W
S
T
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P
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More clues leading to the result SHOWSTOPPER
Buddy explains!
The straight part
We know that "outstanding performance (" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case outstanding performance ( = showstopper.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 SHOWSTOPPER mean?
SHOWSTOPPER noun- A performance or segment of a theatrical production that induces a positive audience reaction strong enough to pause the production.
- Any impediment that prevents all further progress; especially a software bug that must be fixed before any further development is possible.