Girl entering country detailed language (7)

I believe the answer is:

bengali

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'detailed language' is the definition.
'bengali' can be an answer for 'language' (I've seen this before). I am not certain of the 'detailed' bit.

'girl entering country' is the wordplay.
'girl' becomes 'gal'.
'entering' is an insertion indicator.
'country' becomes 'beni' (I am not sure about this - if you are sure you should believe this answer much more).
'gal' inserted within 'beni' is 'BENGALI'.

Can you help me to learn more?

(Other definitions for bengali that I've seen before include "resident in Calcutta?" , "Language of Bangladesh and northeast India" , "From Dhaka or Kolkata, perhaps" , "Asian character" , "Native of Calcutta region" .)

I've seen this clue in The Guardian.

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