Discover Sky broadcasting (3,4)

I believe the answer is:

hit upon

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'discover' is the definition.
The definition and answer can be both to do with ownership as well as being verbs in their base form.
Maybe you can see an association between them that I can't see?

'sky broadcasting' is the wordplay.
'sky' becomes 'hitup' (I am not sure about this - if you are sure you should believe this answer much more).
'broadcasting' becomes 'on'.
'hitup'+'on'='HIT UPON'

Can you help me to learn more?

I've seen this clue in The Times.

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