When released, Fred got out of Mile End (5)

I believe the answer is:

freed

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'when released' is the definition.
'freed' can be an answer for 'released' (I've seen this before). I am not certain of the 'when' bit.

'fred got out of mile end' is the wordplay.
'got' indicates putting letters inside.
'out of mile end' becomes 'e' (I can't explain this - if you can you should believe this answer much more).
'fred' enclosing 'e' is 'FREED'.

Can you help me to learn more?

(Other definitions for freed that I've seen before include "Untied" , "Emancipated, let loose" , "Defer being liberated" , "Released" .)

I've seen this clue in the Evening Standard.

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