The most common and most likely answer to this crossword clue is the 11 plus 5 letter word THREE-POINT TURNS
I've seen this crossword clue in The Guardian
T
H
R
E
E
-
P
O
I
N
T
T
U
R
N
S
More clues leading to the result THREE-POINT TURNS
Buddy explains!
The straight part
We know that "Driving manoeuvres" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case driving manoeuvres = three-point turns.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.