The most common and most likely answer to this crossword clue is the 11 letter word PERFORMANCE
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More clues leading to the result PERFORMANCE
- Awkward behaviour necessarily limiting fellow
- Stage show inevitably packed with people
- For each fine romance is shaky the first night, perhaps
- Show capital in Paris, France more exotic
- Particular action of knight, say, brought in of necessity
- Playing eg Willy Loman, retiring chap’s arrested by police
- Action for each soldier in army
- Show presented by stripper for man celebrating
- Action inevitably attracts us
- Zipper for man certainly keeps acting the part
Buddy explains!

The straight part
We know that "Show" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case show = performance.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 PERFORMANCE mean?
PERFORMANCE noun- The act of performing; carrying into execution or action; execution; achievement; accomplishment; representation by action.
- That which is performed or accomplished; a thing done or carried through; an achievement; a deed; an act; a feat; especially, an action of an elaborate or public character.
- A live show or concert.
- The amount of useful work accomplished estimated in terms of time needed, resources used, etc.
- The actual use of language in concrete situations by native speakers of a language, as opposed to the system of linguistic knowledge they possess (competence), cf. :w:linguistic performance.