Crossword Genius

Pretend to be grownups in building (9)

Ross

I believe the answer is:

playhouse

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

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

'pretend to' is the wordplay.
'pretend' becomes 'play' (playing is a kind of pretending).
'to' becomes 'house' (I can't explain this - if you can you should believe this answer much more).
'play'+'house'='PLAYHOUSE'

'be' is the link.

Can you help me to learn more?

(Other definitions for playhouse that I've seen before include "army theatre" , "Stage" .)

I've seen this clue in The Mirror.
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