On easy street, being as liberated as possible (6)

I believe the answer is:

freest

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

'on easy' is the definition.
I can't tell whether this definition defines the answer.

'street being as liberated as possible' is the wordplay.
I cannot really see how this works, but
'street' could be 'st' (abbreviation) and 'st' is found in the answer.
'liberated' could be 'free' (similar in meaning) and 'free' is located in the answer.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.

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