Browbeat confused old women principally (3)
I believe the answer is:
cow
'browbeat' is the definition.
(I've seen this before)
'confused old women principally' is the wordplay.
'principally' says to take the initial letters.
The first letters of 'confused old women' is 'COW'.
(Other definitions for cow that I've seen before include "Bully" , "Browbeat" , "Intimidate, female ox" , "Disagreeable woman" , "... beast" .)