Irish premier (9)
I believe the answer is:
taoiseach
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">irish premier</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for taoiseach that I've seen before include "Irish PM" , "Irish head of government" , "Leader of the government" , "Irish premier" , "I 'ate chaos (anag) - Irish Republic's prime minister" .)