The most common and most likely answer to this crossword clue is the 8 letter word OVERSIZE
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More clues leading to the result OVERSIZE
Buddy explains!

The straight part
We know that "very large" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case very large = oversize.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 OVERSIZE mean?
OVERSIZE noun- The increased size of the bore of an engine when it is rebored.
- To exceed in size.
- To make larger, or too large.
- To cover with size or gluey matter.
- Larger than normal
- Excessively large