Parrot; a male one, furthermore (8)

I believe the answer is:

cockatoo

'parrot' is the definition.
(cockatoo is a kind of parrot)

'a male one furthermore' is the wordplay.
'a male' becomes 'cock' (male chicken).
'one' becomes 'a' (a thing is one thing).
'furthermore' becomes 'too' (I've seen this before).
'cock'+'a'+'too'='COCKATOO'

(Other definitions for cockatoo that I've seen before include "Australasian parrot" , "Bird, a type of parrot" , "White parrot" , "Parrot native to Australia and Indonesia" , "Illegal Aussie look-out man" .)

I've seen this clue in the Evening Standard.

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