Woman representing a nation? (7)
I believe the answer is:
antonia
'woman' is the definition.
'representing a nation?' is the wordplay.
'representing' indicates anagramming the letters (letters must be re-presented in a new way).
'a'+'nation'='anation'
'anation' with letters rearranged gives 'ANTONIA'.
(Other definitions for antonia that I've seen before include "female" , "Girl's name" , "woman" , "lady" .)