TV as a gift, delivered (3,4)

I believe the answer is:

set free

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'a gift delivered' is the definition.
I can't tell whether this definition defines the answer.

'tv as' is the wordplay.
'tv' becomes 'set' (television set).
'as' becomes 'free' (I can't explain this - if you can you should believe this answer much more).
'set'+'free'='SET FREE'

Can you help me to learn more?

(Other definitions for set free that I've seen before include "Deliver - release" , "Clear" , "Liberate" , "no longer confined" , "Released" .)

I've seen this clue in The Guardian.

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