Wrote a crossword Independent released (3,4)

I believe the answer is:

set free

I'm a little stuck... Click here to teach me more about this clue!

'released' is the definition.
(I've seen this before)

'wrote a crossword independent' is the wordplay.
'wrote a crossword' becomes 'set' (I can't justify this - if you can you should believe this answer much more).
'independent' becomes 'free' (associated in meaning).
'set'+'free'='SET FREE'

Can you help me to learn more?

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

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