Personate in contrived language (9)

I believe the answer is:

esperanto

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

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

'personate' is the wordplay.
'personate' can be anagrammed to 'ESPERANTO'.
However, I am unsure how this is indicated.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for esperanto that I've seen before include "common language" , "No repeats of this artificial language, strangely" , "artificial tongue" , "Ape tenors (anag.)" , "words, set up artificially?" .)

I've seen this clue in The Irish Independent.

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