I had picked up a commentator's accent? (9)
I believe the answer is:
diacritic
'accent?' is the definition.
(I know that diacritic can be written as diacritic)
'i had picked up a commentator's' is the wordplay.
'i had' becomes 'I'd' (contraction).
'picked up' is a reversal indicator.
'commentator's' becomes 'critic' (I can't explain this - if you can you should believe this answer much more).
'id' reversed gives 'di'.
'di'+'a'+'critic'='DIACRITIC'
Can you help me to learn more?
(Other definitions for diacritic that I've seen before include "accent, for example" , "Capable of distinguishing" , "grave perhaps" , "one showing a pronounced difference" , "[ACCENT] , perhaps" .)