I blacken the name of Briton, say (8)

I believe the answer is:

islander

'briton say' is the definition.
(someone from an island)

'i blacken the name of' is the wordplay.
'blacken the name of' becomes 'slander'.
'i'+'slander'='ISLANDER'

(Other definitions for islander that I've seen before include "One who lives off the mainland" , "Eg, Haitian or Cretan" , "native of Borneo, for example" , "One from Islay, Man, etc" , "Corsican, for example" .)

I've seen this clue in The Telegraph.

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