The classy kind (4)
I believe the answer is:
'kind' is the definition.
(I know that kind can be written as sort)
'the classy' is the wordplay.
I cannot really understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
The remaining letters 'sor' 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 sort that I've seen before include "'Variety, type (4)'" , "Group" , "Type, category" , "Arrange systematically" , "Tidy" .)