Sweet Sue today in daft Dan (6)
I believe the answer is:
sundae
'sweet' is the definition.
(sundae is a kind of sweet)
'sue today in daft dan' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'dan' is 'nda' which is present in the answer.
The remaining letters 'sue' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for sundae that I've seen before include "Ice-cream with syrup" , "Sounds like a day for the ice-cream dish" , "Dish of ice-cream, fruit etc - sounds Sabbatical" , "Ice-cream/nut etc. dish" , "'Ice cream topped with fruit, nuts and syrup (6)'" .)