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!

'sweet' is the definition.
(I've seen this before)

'little memory about old departed' is the wordplay.
I cannot quite see how this works, but
'little' could be 'l' (abbreviation) and 'l' is found in the answer.
'about' could be 'c' (circa) and 'c' is located in the answer.
'old' could be 'late' (I've seen this in other clues) and 'late' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for plain chocolate that I've seen before include "Sweet" , "Dark bar" , "Dark confectionery" .)

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