Nicer dessert given to queen (7)
I believe the answer is:
sweeter
'nicer' is the definition.
(I've seen this in another clue)
'dessert given to queen' is the wordplay.
I cannot really understand how this works, but
'dessert' could be 'sweet' (synonyms) and 'sweet' is found within the answer.
'queen' could be 'er' (abbreviation for Elizabeth Regina) and 'er' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for sweeter that I've seen before include "With more sugar" , "More melodious or more sugary" .)