Rashness of Iran to speed development (11)
I believe the answer is:
desperation
'rashness' is the definition.
(thesaurus)
'iran to speed development' is the wordplay.
'development' indicates an anagram.
'iran'+'to'+'speed'='irantospeed'
'irantospeed' with letters rearranged gives 'DESPERATION'.
'of' acts as a link.
(Other definitions for desperation that I've seen before include "State of despair" , "Abject hopelessness" , "Recklessness" , "A state without hope" , "State of hopelessness" .)