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Strange language from criminal in gaol (5)

Ross

I believe the answer is:

lingo

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

This could be a double definition.

'strange language' is the first definition.
(I've seen this before)

'criminal in gaol' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'from' is the link.

Can you help me to learn more?

(Other definitions for lingo that I've seen before include "Jargon, language (colloq.)" , "means to communicate" , "Foreign language or dialect: jargon" , "Language (informally)" , "Vernacular" .)

I've seen this clue in The Sun.
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