Crossword Genius

US civil rights activist swilled a cocktail (3,5)

Ross

I believe the answer is:

ida wells

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'us civil rights activist' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'swilled a cocktail' is the wordplay.
I cannot quite understand how this works, but
'a' is present in the answer.
an anagram of 'swilled' is 'idwells' which is within the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

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