Sweet course: son tucked into justly earned thing (7)
I believe the answer is:
dessert
'sweet course' is the definition.
(I've seen this before)
'son tucked into justly earned thing' is the wordplay.
I cannot quite see how this works, but
'son' could be 'ss' (I've seen this in other clues) and 'ss' is found within 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 dessert that I've seen before include "Christmas pudding maybe" , "Sweet, afters" , "Spotted Dick is one" , "Charlotte maybe" , "Fruit and nuts, perhaps" .)