Engaged by English paper, I turned up (2,3)
I believe the answer is:
in use
'engaged' is the definition.
(I've seen this before)
'english paper i turned up' is the wordplay.
'english' becomes 'e' (abbreviation).
'paper' becomes 'sun' (The Sun, UK newspaper).
'turned up' shows that the letters should be reversed in order.
'e'+'sun'+'i'='esuni'
'esuni' back-to-front is 'IN USE'.
'by' acts as a link.
(Other definitions for in use that I've seen before include "Engaged" , "Being employed - unavailable" , "Currently employed" , "taken?" , "Current" .)