Five characters evidently following revolutionary piano course (8)
I believe the answer is:
chepstow
'five characters evidently' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'following revolutionary piano course' is the wordplay.
'following' means one lot of letters go next to another.
'revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary).
'piano' becomes 'p' (musical abbreviation).
'course' becomes 'stow' (I can't explain this - if you can you should give a lot more credence to this answer).
'che'+'p' is 'chep'.
'chep'+'stow'='CHEPSTOW'
Can you help me to learn more?
(Other definitions for chepstow that I've seen before include "Racecourse in S. Wales" , "Castle in Wye valley" , "Welsh racecourse" , "Welsh town on the Wye" .)