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Blister has to be treated? They may offer alternative medicine (10)

Ross

I believe the answer is:

herbalists

'they may offer alternative medicine' is the definition.
(practitioners of herbal medicine)

'blister has to be treated?' is the wordplay.
'to be treated?' indicates anagramming the letters.
'blister'+'has'='blisterhas'
'blisterhas' with letters rearranged gives 'HERBALISTS'.

I've seen this clue in The Telegraph.
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