Loud female with others grabbing old rocker after upset (7)
I believe the answer is:
ladette
'loud female' is the definition.
(a ladette is a boisterous young woman)
'with others grabbing old rocker after upset' is the wordplay.
'with others' becomes 'etal' (short for 'et alia', Latin for 'and others').
'grabbing' is an insertion indicator.
'old rocker' becomes 'ted'.
'after upset' says the letters should be written backwards (in a down clue, letters go up).
'etal' enclosing 'ted' is 'ettedal'.
'ettedal' in reverse letter order is 'LADETTE'.
(Other definitions for ladette that I've seen before include "Uncouth youth drinking lager in a short skirt?" , "lively girl" , "Crude young woman" , "Tomboy" , "Young woman who acts as badly as a man" .)