Which communication system confuses more co-eds? (5,4)

I believe the answer is:

morse code

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'which communication system' is the definition.
I can't tell whether this defines the answer.

'confuses more co-eds?' is the wordplay.
'confuses' indicates an anagram.
'more'+'co'+'eds'='morecoeds'
'morecoeds' anagrammed gives 'MORSE CODE'.

Can you help me to learn more?

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

I've seen this clue in the Sydney Morning Herald.

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