Dream about Persia (6)
I believe the answer is:
aspire
'dream' is the definition.
(I've seen this before)
'about persia' is the wordplay.
'about' indicates an anagram.
'persia' is an anagram of 'ASPIRE'.
(Other definitions for aspire that I've seen before include "Have an ambitious plan or a lofty goal" , "Have a strong desire to reach an objective" , "Yearn, dream (towards)" , "Long" , "Aim, shoot for" .)