The most common and most likely answer to this crossword clue is the 8 letter word GIGANTIC
G
I
G
A
N
T
I
C
More clues leading to the result GIGANTIC
- Tremendous performance opposed by Conservative
- Enormous American soldier acting badly
- Really great performance — furious father’s left
- Very great job that's temporary and bizarre
- Big concert followed by capers, mostly
- Invasive coronavirus starts after performance by TV presenter – “Mega!”
- Show trick that’s great
- Huge performance taking on worker in charge
- Tremendous performance against Conservative
- Huge performance by one of two presenters in charge
Buddy explains!

The straight part
We know that "Tremendous" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tremendous = gigantic.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 GIGANTIC mean?
GIGANTIC adjective- Very large.
- In the manner of a giant.