The most common and most likely answer to this crossword clue is the 11 letter word UNCOUNTABLE
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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 UNCOUNTABLE mean?
UNCOUNTABLE noun- (grammar) An uncountable noun.
- So many as to be incapable of being counted.
- Incapable of being put into one-to-one correspondence with the natural numbers or any subset thereof.
- (grammar, of a noun) That cannot be used freely with numbers or the indefinite article, and therefore usually takes no plural form. Example: information.