Collection of records I have found behind curved structure (7)
I believe the answer is:
archive
'collection of records' is the definition.
(I've seen this before)
'i have found behind curved structure' is the wordplay.
'i have' becomes 'ive' (contraction of 'I have').
'found behind' says to put letters next to each other (some letters go behind others).
'curved structure' becomes 'arch' (architectural structure).
'ive' after 'arch' is 'ARCHIVE'.
(Other definitions for archive that I've seen before include "Depository for records and documents" , "Collection of documents of an institution or community" , "Vault" , "Stored data" , "Save data for storage" .)