One of the stone circle sites — Aubrey reconstructed about five (7)
I believe the answer is:
avebury
'one of the stone circle sites' is the definition.
(Avebury is the site of a neolithic stone circle)
'aubrey reconstructed about five' is the wordplay.
'reconstructed' indicates anagramming the letters.
'about' means one lot of letters goes inside another.
'five' becomes 'V' (Roman numeral).
'aubrey' with letters rearranged gives 'aebury'.
'aebury' enclosing 'v' is 'AVEBURY'.
(Other definitions for avebury that I've seen before include "Wiltshire stone ring" , "Wiltshire twenty five across circle" , "Wiltshire stone circle" , "NT site near 9" , "ancient ring of stones" .)