Foreign tongue somewhat rich in dialects (5)

I believe the answer is:

hindi

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'foreign tongue' is the definition.
'Hindi' can be an answer for 'tongue' (Hindi is an example). I am not certain of the 'foreign' bit.

'somewhat rich in dialects' is the wordplay.
'somewhat' indicates a hidden word.
'HINDI' can be found hidden inside 'rich in dialects'.

Can you help me to learn more?

(Other definitions for hindi that I've seen before include "Language of northern India" , "It's spoken abroad" , "Asian language" , "Indian language" , "Language derived from Sanskrit" .)

I've seen this clue in The Globe and Mail.

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