Spot Queen's son endlessly meeting female star (5,5)
I believe the answer is:
white dwarf
'star' is the definition.
(I know that white dwarf is a type of star)
'spot queen's son endlessly meeting female' is the wordplay.
'spot' becomes 'whit' (both can mean a small amount).
'queen's son' becomes 'Edward' (Prince Edward, son of Queen Elizabeth).
'endlessly' means to remove the last letter.
'meeting' is a charade indicator (letters next to each other).
'female' becomes 'f' (common abbreviation).
'edward' with its last letter taken away is 'edwar'.
'whit'+'edwar'+'f'='WHITE DWARF'
(Another definition for white dwarf that I've seen is " Star".)