'Queen dead' a lie possibly (8)
I believe the answer is:
adelaide
'queen' is the definition.
(I've seen this before)
'dead a lie possibly' is the wordplay.
'possibly' is an anagram indicator.
'dead'+'a'+'lie'='deadalie'
'deadalie' with letters rearranged gives 'ADELAIDE'.
(Other definitions for adelaide that I've seen before include "Girl" , "somewhere in Australia" , "Australian location" , "Australian capital" , "Queen to William IV - setting for many an 6 test" .)