The most common and most likely answer to this crossword clue is the 9 letter word WORMHOLES
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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.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does WORMHOLES mean?
WORMHOLES noun- A hole burrowed by a worm
- A hypothetical shortcut between two points in spacetime, permitting faster-than-light travel and sometimes time travel.
- A location in a monitor program containing the address of a routine, allowing the user to substitute different functionality.