Dashes to represent Tom in this? (5,4)

I believe the answer is:

morse code

'dashes to represent tom in this?' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

(Other definitions for morse code that I've seen before include "Dot-dash alphabet" , "Signalling system of dots and dashes" , "Means to communicate" , "Means of signalling by dots and dashes" , "Way of sending message" .)

I've seen this clue in The Times.

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