Crossword Genius

We're told any singer's building a tree house (7)

Ross

I believe the answer is:

nesting

'building a tree house' is the definition.
(a nest is a bird's home)

'we're told any singer's' is the wordplay.
'we're told' shows a homophone (sound like).
'singer' becomes 'sting' (singer from The Police).
'any' sounds like 'ne'.
'ne'+'sting'='NESTING'

(Another definition for nesting that I've seen is " (Of birds) building a home".)

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