Leading lives essentially shown in place of records (7)
I believe the answer is:
archive
'place of records' is the definition.
'archive' can be an answer for 'records' (an archive is a collection of records). I'm unsure of the 'place of' bit.
'leading lives essentially' is the wordplay.
'leading' becomes 'arch' (e.g. in arch-enemy).
'essentially' indicates the central letters.
The central letters of 'lives' are 'ive'.
'arch'+'ive'='ARCHIVE'
'shown in' acts as a link.
Can you help me to learn more?
(Other definitions for archive that I've seen before include "Public records store" , "Historical collection of documents" , "Documents store" , "Repository of historical records" , "Record repository" .)