Crossword Genius

I'll get into free grass, becoming enlightened (12)

Ross

I believe the answer is:

liberalising

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

'i'll get into free' is the definition.
I can't judge whether this defines the answer.

'grass becoming enlightened' is the wordplay.
I cannot quite understand how this works, but
'grass' could be 'sing' (I've seen this in other clues) and 'sing' is located in the answer.
'enlightened' could be 'liberal' (I've seen this before) and 'liberal' is present in the answer.
A single letter 'i' remains which might be clued in a way I don't see.
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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