Your smoke detector must incorporate one (5)
I believe the answer is:
noise
'your' is the definition.
I can't judge whether this definition defines the answer.
'smoke detector must incorporate one' is the wordplay.
I cannot quite see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is located in the answer.
'smoke detector' could be 'nose' (I've seen this in another clue) and 'nose' is located in the leftover letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for noise that I've seen before include "Sound, disagreeable perhaps" , "Sound - gossip" , "Racket, din" , "Rumour" , "Hubbub" .)