Even leading he'll see a score in front (8)
I believe the answer is:
musician
'even leading he'll see a score in front' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'he'll see a score in front' is the wordplay.
'he'll' becomes 'ian' (I can't explain this - if you can you should give a lot more credence to this answer).
'see a score' becomes 'music' (I've seen this before).
'in front' is a charade indicator (letters next to each other).
'ian' put after 'music' is 'MUSICIAN'.
Can you help me to learn more?
(Other definitions for musician that I've seen before include "Violinist, e.g." , "Although minus CIA, one plays" , "Instrumentalist, player" , "Professional instrumentalist" , "Composer or performer of vocal or instrumental sounds" .)