We assume star with dope needs treatment (8)

I believe the answer is:

adopters

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'we assume' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'star with dope needs treatment' is the wordplay.
'with' means one lot of letters go next to another.
'needs treatment' is an anagram indicator (letters must be processed or treated).
'star'+'dope'='stardope'
'stardope' anagrammed gives 'ADOPTERS'.

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