TV detective's code (5)

I believe the answer is:

morse

I believe this clue is a double definition.

'tv detective's' is the first definition.
(Inspector Morse)

'code' is the second definition.
(Morse code)

(Other definitions for morse that I've seen before include "Walrus - TV detective" , "One who enjoyed solving code" , "Fictional inspector; code" , "Dot-dash code inventor" , "Colin Dexter's fictional detective" .)

I've seen this clue in The Mirror.

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