One unable to fly into a passion turns to the bottle (7)

I believe the answer is:

remuage

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

'turns to the bottle' is the definition.
I can't judge whether this defines the answer.

'one unable to fly into a passion' is the wordplay.
'one unable to fly' becomes 'emu' (I can't justify this - if you can you should give a lot more credence to this answer).
'into' means one lot of letters goes inside another.
'a passion' becomes 'rage' (synonyms).
'emu' going within 'rage' is 'REMUAGE'.

Can you help me to learn more?

I've seen this clue in The Times.

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