The most common and most likely answer to this crossword clue is the 9 letter word ARMATURES
I've seen this crossword clue in Financial Times
A
R
M
A
T
U
R
E
S
Buddy explains!
The straight part
We know that "Coils" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case coils = armatures.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 ARMATURES mean?
ARMATURES noun- The rotating part of an electric motor or dynamo, which mostly consists of coils of wire around a metal core.
- The moving part in an electromechanical device like a loudspeaker or a buzzer.
- A piece of soft steel or iron that connects the poles of a magnet
- A supporting framework in a sculpture.
- A kinematic chain (a system of bones or rigid bodies connected by joints) that is used to pose and deform models, often character models.
- A protective organ, structure, or covering of an animal or plant, for defense or offense, like claws, teeth, thorns, or the shell of a turtle.
- Armor, or a suit of armor.
- Any apparatus for defence.
- The frame of a pair of glasses.
- To provide with an armature (any sense).