Crossword Genius

Condemn group of sisters making nurse be in charge (7)

Ross

I believe the answer is:

convict

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

'condemn' is the definition.
(thesaurus)

'group of sisters making nurse be in charge' is the wordplay.
I cannot quite understand how this works, but
'of' could be 'o' and 'o' is found in the answer.
'in charge' could be 'ic' (abbreviation for 'in charge') and 'ic' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for convict that I've seen before include "Find guilty - criminal in prison" , "Jailbird" , "One would get transportation" , "One serving time" , "Prove guilty" .)

I've seen this clue in The Independent.
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