Deliver TV at no cost (3,4)
I believe the answer is:
set free
'deliver' is the definition.
(I've seen this before)
'tv at no cost' is the wordplay.
'tv' becomes 'set' (television set).
'at no cost' becomes 'free' (I've seen this in another clue).
'set'+'free'='SET FREE'
(Other definitions for set free that I've seen before include "without the box" , "no longer detained" , "Turn loose" , "Liberate" , "Release, remove restraints" .)