Question of treating ore in a new way (11)
I believe the answer is:
interrogate
'question' is the definition.
(I know that question can be written as interrogate)
'treating ore in a new way' is the wordplay.
'in a new way' indicates an anagram.
'treating'+'ore'='treatingore'
'treatingore' with letters rearranged gives 'INTERROGATE'.
'of' acts as a link.
(Other definitions for interrogate that I've seen before include "Formally question" , "Cross-examine" , "Question closely" , "Ask questions of (someone)" .)