Open here with a song (4,5)

I believe the answer is:

over there

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'a song' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'open here' is the wordplay.
'open' becomes 'overt' (synonyms).
'overt'+'here'='OVER THERE'

'with' is the link.

Can you help me to learn more?

(Other definitions for over there that I've seen before include "jingoistic old number" , "not far away" , "Not in this place - yonder" .)

I've seen this clue in the Evening Standard.

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