Hint: end of sunbathing good (4)
I believe the answer is:
tang
'hint' is the definition.
(thesaurus)
'end of sunbathing good' is the wordplay.
I cannot really see how this works, but
'good' could be 'g' (abbreviation) and 'g' is present in the answer.
The remaining letters 'tan' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for tang that I've seen before include "characteristic quality" , "Sharp smell of gnat" , "Coarse seaweed" , "Tart spiciness" , "Thrash with good" .)