Woman say from the South Circular area (5)
I believe the answer is:
henge
'circular area' is the definition.
The definition suggests a singular noun which matches the answer.
'woman say from the south' is the wordplay.
'woman' becomes 'hen' ().
'say' becomes 'eg' (both can mean for example).
'from the south' is a reversal indicator (in a down clue, letters go up).
'eg' backwards is 'ge'.
'hen'+'ge'='HENGE'
Can you help me to learn more?
(Other definitions for henge that I've seen before include "ancient monument" , "Ancient stone circle" , "Bronze Age stone circle" , "Prehistoric circular area" .)