Another sentence has another language (4)

I believe the answer is:

erse

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

'another language' is the definition.
'erse' can be an answer for 'language' (historical term for Scottish Gaelic). I am not sure about the 'another' bit.

'another sentence has' is the wordplay.
'has' says the answer is hidden in the clue.
'ERSE' is hidden in the letters of 'another sentence'.

Can you help me to learn more?

(Other definitions for erse that I've seen before include "Possibly the language" , "Irish Gaelic language" , "Celtic tongue" , "Old name for Celtic languages" , "Old Scots or Irish Gaelic" .)

I've seen this clue in The Daily Express.

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