Queen in free negotiation about bird (9)
I believe the answer is:
nefertiti
'queen' is the definition.
(I know that Nefertiti is a queen)
'in free negotiation about bird' is the wordplay.
'negotiation' indicates an anagram.
'about' indicates putting letters inside.
'bird' becomes 'tit' (tit is a kind of bird).
'in'+'free'='infree'
'infree' anagrammed gives 'neferi'.
'neferi' enclosing 'tit' is 'NEFERTITI'.
(Other definitions for nefertiti that I've seen before include "Name of queen" , "African Queen" , "Oddly, the Egyptian queen is an entire fit" , "Queen on the Nile" , "Egyptian beauty queen" .)