From Iranians we require explanation (6)
I believe the answer is:
answer
'explanation' is the definition.
(thesaurus)
'from iranians we require' is the wordplay.
'from' indicates a hidden word.
'ANSWER' is hidden within 'iranians we require'.
(Other definitions for answer that I've seen before include "'Daisy, Daisy, give me your ...... do'" , "What you need" , "'A soft . . . . . . turneth away wrath'" , "Response to a question" , "Retort" .)