School building for students to live in is going to... (5)

I believe the answer is:

shall

'is going to' is the definition.

'school building for students to live in' is the wordplay.
'school' becomes 's'.
'building for students to live in' becomes 'hall' (halls can refer to university accommodation ).
's'+'hall'='SHALL'

(Other definitions for shall that I've seen before include "' - - We Dance?'" , "Will, must, is to" .)

I've seen this clue in The Independent.

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