Cockney concealed verse on Irish county heavens (1,2,7)

I believe the answer is:

i do declare

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'heavens' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'cockney concealed verse on irish county' is the wordplay.
'cockney concealed' becomes ''id' ('hid' - 'hide' can be a synonym of 'conceal' - said with the 'H' dropped - a cockney accent.).
'verse' becomes 'ode' (ode is a type of poem or verse).
'on' means one lot of letters go next to another.
'irish county' becomes 'clare' (County Clare in Ireland).
'id'+'ode'+'clare'='I DO DECLARE'

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I've seen this clue in the Sydney Morning Herald.

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