The most common and most likely answer to this crossword clue is the 10 letter word MONUMENTAL
I've seen this crossword clue in The Guardian
M
O
N
U
M
E
N
T
A
L
More clues leading to the result MONUMENTAL
- Second Greek character, intellectual and imposing
- Massive memorial by a lake
- Impressive intellectual ringing round miners
- Huge old quantity halved in a sort of arithmetic
- Enormous tunnel blown up with ammo
- Important day of thinking about university
- Maureen, with new uniform in mind, is impressive
- Huge amount thrown around — pounds — draws soldiers in
- Impressive shrine by a lake
- Half a day with university intellectual is of great importance
Buddy explains!

The straight part
We know that "Huge" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case huge = monumental.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 MONUMENTAL mean?
MONUMENTAL adjective- In the manner of a monument.
- Large, grand and imposing.
- Taking a great amount of time and effort to complete.
- Relating to monuments.