The most common and most likely answer to this crossword clue is the 7 letter word PISTONS
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More clues leading to the result PISTONS
Buddy explains!

The straight part
We know that "Engine drivers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case engine drivers = pistons.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 PISTONS mean?
PISTONS noun- A solid disk or cylinder that fits inside a hollow cylinder, and moves under pressure (as in an engine) or displaces fluid (as in a pump)
- A valve device in some brass instruments for changing the pitch