Inspector of signals? (5)
I believe the answer is:
morse
This might be a double definition.
'inspector' is the first definition.
(Inspector Morse)
'of signals?' is the second definition.
The definition suggests a singular noun which matches the answer.
Can you help me to learn more?
(Other definitions for morse that I've seen before include "One who enjoyed solving code" , "& 24 Across Encrypted language" , "TV Oxford cop" , "Colin Dexter's fictional detective" , "Dot-dash code inventor" .)