Having an air of protest, bubbly Rachel loves to interrupt most of females (2,5,8)
I believe the answer is:
we shall overcome
Here is my best explanation:
'having an air of protest' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'bubbly rachel loves to interrupt most of females' is the wordplay.
'bubbly' is an anagram indicator (I've seen this in other clues).
'to interrupt' indicates putting letters inside.
'most of females' becomes 'wome' (I can't justify this - if you can you should give a lot more credence to this answer).
'rachelloves' is an anagram of 'eshalloverc'.
'eshalloverc' going into 'wome' is 'WE SHALL OVERCOME'.