Preserve first-class news channel preserving first-class work (7,3)
I believe the answer is:
jamaica inn
'work' is the definition.
(I've seen this before)
'preserve first-class news channel preserving first-class' is the wordplay.
'preserve' becomes 'jam' (jam is a kind of preserve).
'first class' becomes 'ai' (Aj - top quality).
'news channel' becomes 'cnn' (I've seen this in another clue).
'preserving' means one lot of letters goes inside another.
'first class' becomes 'ai' (Aj - top quality).
'cnn' enclosing 'ai' is 'cainn'.
'jam'+'ai'+'cainn'='JAMAICA INN'
(Other definitions for jamaica inn that I've seen before include "Book by Daphne du Maurier" , "Daphne du Maurier novel" , "story of seaside crime" , "work of fiction" .)