Organise poor to crush iron dictator (9)
I believe the answer is:
oppressor
'dictator' is the definition.
(thesaurus)
'organise poor to crush iron' is the wordplay.
'organise' indicates an anagram.
'to crush' indicates putting letters inside (inserted letters are crushed between others).
'iron' becomes 'press' (I've seen this before).
'poor' is an anagram of 'opor'.
'opor' placed around 'press' is 'OPPRESSOR'.
(Other definitions for oppressor that I've seen before include "One subjects others to undue pressure" , "One who keeps another in subjection" , "Persecutor of proposers" , "Proposers for one who persecutes" , "One tyrannises" .)