Crossword Genius

Building it's the custom to be silent going round (6)

Ross

I believe the answer is:

museum

I'm a little stuck... Click here to teach me more about this clue!

'building' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?

'the custom to be silent going round' is the wordplay.
'the custom' becomes 'use' (use is a kind of custom).
'to be silent' becomes 'mum' (keep mum).
'going round' is an insertion indicator (some letters go around others).
'use' put inside 'mum' is 'MUSEUM'.

'it's' acts as a link.

Can you help me to learn more?

(Other definitions for museum that I've seen before include "Building in which historical or scientific items are exhibited" , "Building for exhibition of historical objects" , "depository for historical objects" , "Place for exhibits of special interest" , "Building to display objects of historical interest" .)

I've seen this clue in The Globe and Mail.
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