The most common and most likely answer to this crossword clue is the 14 letter word ACCOUNTABILITY
I've seen this crossword clue in The Times
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More clues leading to the result ACCOUNTABILITY
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The straight part
We know that "capacity to get brought to book" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case capacity to get brought to book = accountability.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.
Crossword Answer definitions
ACCOUNTABILITY noun- The state of being accountable; liability to be called on to render an account; accountableness; responsible for; answerable for.
- The obligation imposed by law or lawful order or regulation on an officer or other person for keeping accurate record of property, documents, or funds. The person having this obligation may or may not have actual possession of the property, documents, or funds. Accountability is concerned primarily with records, while responsibility is concerned primarily with custody, care, and safekeeping.