Title of various Iranians (3)
I believe the answer is:
sir
'title' is the definition.
(I've seen this before)
'of various iranians' is the wordplay.
'of' says the answer is hidden in the clue.
'SIR' is hidden in the letters of 'various iranians'.
(Other definitions for sir that I've seen before include "Title given to 10 Across" , "Formal term of address" , "Term of address for a gentleman" , "Honorary male title" , "Polite form of address to a man" .)