Make a Claim Retrospectively Valid

This page is the CodyCross answer for the clue below from La Bella Roma, Group 407, Puzzle 3 (Leonardo Da Vinci).

Question is: Make a Claim Retrospectively Valid

and the answer is: BACKDATE

Word Meaning:

BACKDATE — To give or assign a date to a document that is earlier than the current or true date.

Definitions from Wiktionary.