Language in foreign glen I don't speak! (7)
I believe the answer is:
english
'language' is the definition.
(English language is an example)
'foreign glen i don't speak' is the wordplay.
I cannot really see how this works, but
an anagram of 'glen' is 'engl' which is within the answer.
'i' is present in the answer.
The remaining letters 'sh' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'in' acts as a link.
Can you help me to learn more?
(Other definitions for english that I've seen before include "The nationality in his glen" , "to write these answers in?" , "A country condiment?" , "Tongue" , "See 10" .)