Crossword Genius

“Charlie,” to his younger brother, is cocaine (5)

Ross

I believe the answer is:

candy

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

'his younger brother is cocaine' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'charlie to' is the wordplay.
'charlie' becomes 'C' (phonetic alphabet).
'to' becomes 'andy' (I can't justify this - if you can you should give a lot more credence to this answer).
'c'+'andy'='CANDY'

Can you help me to learn more?

(Other definitions for candy that I've seen before include "Sugary sweet" , "Girl's name (diminutive)" , "American confectionary" , "American sweets" , "Crystallised sugar; US sweets" .)

I've seen this clue in The Guardian.
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