House housing a fierce woman (6)
I believe the answer is:
virago
'fierce woman' is the definition.
'house housing a' is the wordplay.
'house' becomes 'virgo' (astrological 'house' associated with Virgo).
'housing' means one lot of letters goes inside another.
'virgo' going around 'a' is 'VIRAGO'.
(Other definitions for virago that I've seen before include "Manlike woman?" , "Scold" , "Harridan" , "Loudly fierce or abusive woman" , "domineering female" .)