The most common and most likely answer to this crossword clue is the 11 letter word RELIABILITY
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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.
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What does RELIABILITY mean?
RELIABILITY noun- The quality of being reliable, dependable or trustworthy.
- The ability to measure the same thing consistently (of a measurement indicating the degree to which the measure is consistent); that is, repeated measurements would give the same result (See also validity).
- Measurable time of work before failure