Press maybe turned to corrupt umpire? (8)
I believe the answer is:
mediator
'umpire?' is the definition.
(thesaurus)
'press maybe turned to corrupt' is the wordplay.
'press maybe' becomes 'media' (the press is part of the media. I am not sure about the 'maybe' bit.).
'turned' says the letters should be written in reverse.
'to corrupt' becomes 'rot'.
'rot' in reverse letter order is 'tor'.
'media'+'tor'='MEDIATOR'
Can you help me to learn more?
(Other definitions for mediator that I've seen before include "Go-between, negotiator" , "peacemaker" , "referee" , "Kind of arbitrator - one to admire" , "Negotiator between opposing parties" .)