Crossword Genius

Further evidence Robert is replacing Penny in council (13)

Ross

I believe the answer is:

corroboration

'further evidence' is the definition.
'corroboration' can be an answer for 'evidence' (thesaurus). I'm unsure of the 'further' bit.

I don't understand how the remainder of the clue works.

(Other definitions for corroboration that I've seen before include "Confirmation" , "Further proof" .)

Want a hint initially instead of a full solution? Install my app