Special remedy for a fingerpicking style? (7)
I believe the answer is:
nostrum
'special remedy' is the definition.
I can't explain the remainder of the clue.
(Other definitions for nostrum that I've seen before include "Hypothetical remedy for all ills" , "Patent medicine of highly questionable value" , "our Latin" , "Patent medicine with questionable efficacy" , "Tonic" .)