The most common and most likely answer to this crossword clue is the 10 letter word SEXTILLION
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Buddy explains!
The straight part
We know that "Huge number" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case huge number = sextillion.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 SEXTILLION mean?
SEXTILLION numeral- (US; modern British & Australian, short scale) A trillion billion: 1 followed by 21 zeros, 1021.
- (dated British & Australian, long scale) A million quintillion: 1 followed by 36 zeros, 1036.