Crossword Genius

Ambassador's sister vicious at heart (6)

Ross

I believe the answer is:

nuncio

'ambassador's' is the definition.
(I've seen this before)

'sister vicious at heart' is the wordplay.
'sister' becomes 'nun' (sister is a term of address for a nun).
'at heart' says to take the centre.
The centre of 'vicious' is 'cio'.
'nun'+'cio'='NUNCIO'

(Other definitions for nuncio that I've seen before include "Papal emissary" , "Papal ambassador" , "Pope's diplomatic representative" , "Sent by the Pope" , "Pope's ambassador" .)

I've seen this clue in The Guardian.
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