Crossword Genius

Ibis are assembled in vast region (7)

Ross

I believe the answer is:

siberia

'vast region' is the definition.
(I've seen this before)

'ibis are assembled' is the wordplay.
'assembled' is an anagram indicator.
'ibis'+'are'='ibisare'
'ibisare' anagrammed gives 'SIBERIA'.

'in' acts as a link.

(Other definitions for siberia that I've seen before include "Russian far-east" , "Region in former USSR noted for harsh winters and notorious for prison camps" , "Arctic region" , "Former place of exile for a Russian" , "'Region of Russia, famous for its long, cold winters (7)'" .)

I've seen this clue in The Sun.
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