Crossword Genius

Evidence of persistent smoke detector? (11)

Ross

I believe the answer is:

stethoscope

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'evidence of persistent smoke' is the first definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'detector?' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I can't see?

Can you help me to learn more?

(Other definitions for stethoscope that I've seen before include "Medical instrument" , "Instrument used in listening" , "listening device" , "Doctor's instrument" .)

I've seen this clue in The Telegraph.
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