The most common and most likely answer to this crossword clue is the 9 letter word MACHINIST
I've seen this crossword clue in The Daily Telegraph
M
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More clues leading to the result MACHINIST
- This man I set to work with contraption initially?
- One working on a device that's a hit in film
- Engineer endlessly longing to be cloaked in obscurity
- User of device, a feature in film
- A feature film’s about manual worker
- Factory worker achieving speed of sound in back street
- Factory worker producing cars on time collecting a high honour
- Turner say, seeing a feature in fog
Buddy explains!

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 MACHINIST mean?
MACHINIST noun- A constructor of machines and engines; one versed in the principles of machines.
- One skilled in the use of machine tools for fashioning metal parts or tools out of metal.
- A person who operates machinery.
- A person employed to shift scenery in a theater.