I'd help reconstruction of this Greek city (6)
I believe the answer is:
delphi
'greek city' is the definition.
'Delphi' can be an answer for 'city' (Delphi is an example). I am not certain of the 'greek' bit.
'i'd help reconstruction of' is the wordplay.
'reconstruction of' indicates an anagram (I've seen 'reconstructions' mean this).
'id'+'help'='idhelp'
'idhelp' anagrammed gives 'DELPHI'.
'this' acts as a link.
Can you help me to learn more?
(Other definitions for delphi that I've seen before include "Greek site of Apollo's most famous oracle" , "'Ancient Greek city, site of the oracle (6)'" , "Sacred site" , "Ancient Greek town with 21" , "Where Apollo's most famous oracle spoke in Greece" .)