English schoolboy takes in second Baltic language (8)

I believe the answer is:

estonian

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

'baltic language' is the definition.
'estonian' can be an answer for 'language' (I've seen this before). I'm not sure about the 'baltic' bit.

'english schoolboy takes in second' is the wordplay.
'english schoolboy' becomes 'etonian' (I've seen this in another clue).
'takes in' is an insertion indicator.
'second' becomes 's' (common abbreviation).
'etonian' enclosing 's' is 'ESTONIAN'.

Can you help me to learn more?

(Other definitions for estonian that I've seen before include "One from a Baltic state" , "Eastern European" , "From Tallinn, for example" , "Eastern Europe" , "Northern European" .)

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

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