Subscribe to nothing in front of artist's wife (7)
I believe the answer is:
signora
'wife' is the definition.
(signora is a kind of wife)
'subscribe to nothing in front of artist's' is the wordplay.
'subscribe' becomes 'sign' ('sign' can be a synonym of 'subscribe').
'to nothing' becomes 'o' (looks like zero - 0).
'in front of' means one lot of letters go next to another.
'artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'sign'+'o'+'ra'='SIGNORA'
(Other definitions for signora that I've seen before include "married woman in Florence?" , "wife on the Continent" , "lady from Italy" , "Foreign woman" , "Italian woman" .)