The violin part is playable, albeit tricky (6)
I believe the answer is:
bridge
'the violin' is the definition.
(thesaurus)
'part is playable albeit tricky' is the wordplay.
I cannot quite see how this works, but
'part' could be 'ridge' (I have seen 'Part of mountain' mean 'ridge' so perhaps 'part' could also mean 'ridge') and 'ridge' is present in the answer.
A single letter 'b' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bridge that I've seen before include "Card-game" , "British composer" , "Span or connect" , "may involve suspension" , "Spanning structure to allow passage" .)