Doctors warn Lady Heather will get a painful lesson (5,3,4,3)

I believe the answer is:

learn the hard way

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'get a painful lesson' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'doctors warn lady heather' is the wordplay.
'doctors' indicates anagramming the letters.
'warn'+'lady'+'heather'='warnladyheather'
'warnladyheather' with letters rearranged gives 'LEARN THE HARD WAY'.

'will' acts as a link.

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

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