Sadly rue putting a call out for a panacea (7)

I believe the answer is:

cureall

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

'a call out for a panacea' is the wordplay.
'a call out' becomes 'all' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'a panacea' becomes 'cure' (I've seen this in another clue).
'all' put after 'cure' is 'CUREALL'.

'putting' acts as a link.

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I've seen this clue in the Evening Standard.

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