In Egypt, it legalises ownership (5)
I believe the answer is:
title
'ownership' is the definition.
(I have seen 'Legal ownership ' mean 'title' so perhaps 'ownership' could also mean 'title')
'in egypt it legalises' is the wordplay.
'in' indicates the answer is hidden within the clue.
'TITLE' can be found hidden inside 'egypt it legalises'.
(Other definitions for title that I've seen before include "Chapter heading" , "Handle" , "Sir, or madam" , "Mr or Mrs, say" , "Document showing legal right to possess a property" .)