Crossword Genius

In which the Indian said the Indian huts had collapsed? (10)

Ross

I believe the answer is:

hindustani

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'collapsed?' is the definition.
Although both the answer and definition are adjectives, I can't understand how they can define each other.

'in which the indian said the indian huts' is the wordplay.
'indian huts' anagrams to 'HINDUSTANI'.
Though, I'm not clear how the anagram is indicated.

'had' acts as a link.

Can you help me to learn more?

(Other definitions for hindustani that I've seen before include "Dialect of Hindi" , "Converting device" , "tongue" , "Language" , "Indians" .)

I've seen this clue in the Evening Standard.
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