Protest number arrive unannounced at home and end with partying (6,2,3,4)
I believe the answer is:
candle in the wind
'protest number' is the definition.
'candle in the wind' can be an answer for 'number' (I have seen 'A number' mean 'candle in the wind' so perhaps 'number' could also mean 'candle in the wind'). I am not certain of the 'protest' bit.
'arrive unannounced at home and end with partying' is the wordplay.
'arrive unannounced' becomes 'candle' (I can't justify this - if you can you should believe this answer much more).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'and' means one lot of letters go next to another.
'partying' is an anagram indicator (I've seen 'parties' mean this (the letters move or party around)).
'end'+'with'='endwith'
'endwith' is an anagram of 'thewind'.
'candle'+'in'+'thewind'='CANDLE IN THE WIND'
Can you help me to learn more?
(Other definitions for candle in the wind that I've seen before include "A number" , "tribute song" .)