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Health policy to dress chief alpha in case of incontinence? (2,5,1,3)

Ross

I believe the answer is:

an apple a day

I'm a little stuck... Click here to teach me more about this clue!

'case of incontinence?' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'health policy to dress chief alpha' is the wordplay.
I cannot really understand how this works, but
'chief' could be 'lead' (I've seen this in another clue) and 'lead' is located in the answer.
'alpha' could be 'a' (phonetic alphabet: alpha, bravo, charlie etc.) and 'a' is located in the answer.
This explanation may well be incorrect...

'in' acts as a link.

Can you help me to learn more?

(Another definition for an apple a day that I've seen is " What supposedly keeps the doctor away".)

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