Repeating requirement: "Time to oust MP" (9)
I believe the answer is:
iterative
'repeating' is the definition.
(I've seen this before)
'requirement time to oust mp' is the wordplay.
I cannot really see how this works, but
'time' could be 'era' (era is a kind of time) and 'era' is found in the answer.
This explanation may well be incorrect...
(Other definitions for iterative that I've seen before include "Involving repetition" , "bears repeating" , "repeated" , "Relating to repetition" .)