The most common and most likely answer to this crossword clue is the 10 letter word CRANKSHAFT
I've seen this crossword clue in The Daily Telegraph
C
R
A
N
K
S
H
A
F
T
More clues leading to the result CRANKSHAFT
- Nut to rip off part of the engine
- Part of transmission is unsafe? Son to set firm
- Engine part with nut on screw
- Engine component about level with small handle
- Do put on nut in part of engine
- Rows with female in chat about feature of transmission
- Nuts attached to bonnet maybe limiting force in part of engine
- Nuts start to hold back part of engine
- Eccentric folk handle component of engine
- Eccentric people have Henry behind main rotating rod
Buddy explains!

The straight part
We know that "feature of transmission" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case feature of transmission = crankshaft.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 CRANKSHAFT mean?
CRANKSHAFT noun- A rotating shaft that drives (or is driven by) a crank.