Theoretically working daily? (2,5)
I believe the answer is:
on paper
'theoretically' is the definition.
('on paper' can be a synonym of 'theoretically')
'working daily?' is the wordplay.
'working' becomes 'on'.
'daily?' becomes 'paper' (newspaper).
'on'+'paper'='ON PAPER'
(Other definitions for on paper that I've seen before include "Planned (in theory)" , "Where one might write" , "Exam may be" , "Theoretically" , "Theoretical" .)