The most common and most likely answer to this crossword clue is the 8 letter word MOLEHILL
I've seen this crossword clue in Independent
M
O
L
E
H
I
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L
More clues leading to the result MOLEHILL
Buddy explains!

The straight part
We know that "Earth thrown up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case earth thrown up = molehill.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 MOLEHILL mean?
MOLEHILL noun- A small mound of earth created by a mole's burrowing underneath the surface of the ground.