Turning more boring, church fixture, repeated (7)
I believe the answer is:
rematch
'fixture repeated' is the definition.
I can't judge whether this definition defines the answer.
'turning more boring church' is the wordplay.
'turning' shows that the letters should be reversed in order.
'more boring' becomes 'tamer' (I am not sure about this - if you are sure you should believe this answer much more).
'church' becomes 'ch' (common abbreviation).
'tamer' written backwards gives 'remat'.
'remat'+'ch'='REMATCH'
Can you help me to learn more?
(Other definitions for rematch that I've seen before include "Another game" , "new bout" , "Later encounter" , "Return game" , "Return fixture" .)