The most common and most likely answer to this crossword clue is the 10 letter word EARTHMOVER
I've seen this crossword clue in The Guardian
E
A
R
T
H
M
O
V
E
R
Buddy explains!
The straight part
We know that "Bulldozer great sex?/Bulldozer/great sex?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bulldozer great sex?/bulldozer/great sex? = earthmover.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 EARTHMOVER mean?
EARTHMOVER noun- A vehicle designed to excavate or transport earth in large quantities.