Rouseabout has trouble with language (4-6)

I believe the answer is:

blue-tongue

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

'rouseabout' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'trouble with language' is the wordplay.
'trouble with' becomes 'blue' (I can't justify this - if you can you should give a lot more credence to this answer).
'language' becomes 'tongue' (tongue can mean a language).
'blue'+'tongue'='BLUE-TONGUE'

'has' is the link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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