The most common and most likely answer to this crossword clue is the 10 letter word DIPLODOCUS
I've seen this crossword clue in Independent
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More clues leading to the result DIPLODOCUS
- Dinosaur's decline complete in the vicinity
- Prehistoric creature complete in hollow place
- Lower position defining party, a dinosaur
- Go under: so could swimming dinosaur
- One had a huge amount of meat after I’d served up nasty cold soup!
- Old copper goes after two policemen start to suspect one hasn’t been seen in ages
Buddy explains!
The straight part
We know that "one hasn’t been seen in ages" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one hasn’t been seen in ages = diplodocus.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 DIPLODOCUS mean?
DIPLODOCUS noun- Any of several herbivorous sauropod dinosaurs, of the genus Diplodocus, known as fossils from the late Jurassic in North America.