Sign about a shrew (6)

I believe the answer is:
virago
'shrew' is the definition.
(virago is a kind of shrew)
'sign about a' is the wordplay.
I cannot quite see how this works, but
'sign' could be 'v' (a V-sign a gesture made with two fingers) and 'v' is found within the answer.
'about' could be 'a' (abbreviation in Chambers) and 'a' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for virago that I've seen before include "Strong and aggressive woman" , "Bad-tempered woman" , "Formidable female" , "A fiery or abusive woman" , "Scolding or domineering woman" .)
