Crossword Genius

Sweet little memory about old departed (5,9)

Ross

I think it could be either:

plain chocolate

white chocolate

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

'departed' is the definition.
I know nothing about this answer so I can't judge whether this works.

'sweet little memory about old' is the wordplay.
I cannot quite see how this works, but
'sweet' could be 'choc' (I've seen this before) and 'choc' is located in the answer.
'little' could be 'whit' (I've seen this before) and 'whit' is found in the answer.
'about' could be 'a' (abbreviation in Chambers) and 'a' is located in the answer.
'old' could be 'o' (common abbreviation eg in OE for Old English) and 'o' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for white chocolate that I've seen is " sweet thing".)

I've seen this clue in The Sunday Times and The Times.
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