Women, Burt, became second in command (6,3)
I believe the answer is:
number two
'second in command' is the definition.
(I've seen this before)
'women burt became' is the wordplay.
'became' indicates anagramming the letters (I've seen 'becomes' mean this).
'women'+'burt'='womenburt'
'womenburt' with letters rearranged gives 'NUMBER TWO'.
(Other definitions for number two that I've seen before include "Second in command" , "Assistant" , "vice" , "deputy" , "Dump" .)