Language I long to learn? (5)

I believe the answer is:

lingo

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'language' is the definition.
(informal term for language)

'i long to learn?' is the wordplay.
'i long' anagrams to 'LINGO'.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for lingo that I've seen before include "Language, colloquially speaking." , "Vernacular" , "Argot" , "Tongue" , "Jargon, language (colloq.)" .)

I've seen this clue in the Evening Standard.

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