Crossword Genius

One using C and D three times with guitar playing (4,6)

Ross

I believe the answer is:

drug addict

I'm a little stuck... Click here to teach me more about this clue!

'one using c and d three times with guitar playing' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'one using c and d' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found within the answer.
'c' is present in the answer.
'd' is within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.
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