Black and blue balls ... settle down! (4,4)
I believe the answer is:
blow over
'settle down' is the definition.
'blow over' can be an answer for 'down' (thesaurus). I am unsure of the 'settle' bit.
'black and blue balls' is the wordplay.
'black' becomes 'b' (abbreviation as in pencil classifications).
'and' is a charade indicator (letters next to each other).
'blue' becomes 'low' (both can mean sad).
'balls' becomes 'over' (I've seen this in other clues).
'b'+'low'+'over'='BLOW OVER'
Can you help me to learn more?
(Other definitions for blow over that I've seen before include "Fizzle out" , "Pass quickly and be forgotten" , "Cease to be a problem" , "Fade away without mishap" , "Die down without serious outcome, as storm may" .)