The most common and most likely answer to this crossword clue is the 9 letter word OVERLARGE
O
V
E
R
L
A
R
G
E
More clues leading to the result OVERLARGE
- Rather obese on account of swilling lager
- Excessively big deliveries mailman’s core rage, possibly
- Mixture of ore and gravel not as small as required?
- After massage R. Laver ego too big?
- Played grave role in Titanic
- Perhaps having consumed too much, maiden, say, spilt lager
- Far from skinny admirer is cycling prior to changing gear
- Terminated boy almost, rogue, not even immensely big
- Too big on regal upheaval
- Very rare Lego set is too big
Buddy explains!

The straight part
We know that "too big" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case too big = overlarge.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 OVERLARGE mean?
OVERLARGE adjective- Excessively large; too big; oversize.
- Too extravagantly, overconfidently.