Modern Geordie wife (3)
I believe the answer is:
new
'modern' is the definition.
(I know that modern can be written as New)
'geordie wife' is the wordplay.
'geordie' becomes 'NE' (Geordies are from Tyneside in the North East).
'wife' becomes 'w' (abbreviation).
'ne'+'w'='NEW'
(Other definitions for new that I've seen before include "Not previously used" , "Original" , "Recently made, etc" , "Contemporary" , "Fresh, unused" .)