Joe finally starts playing after grabbing bass guitar (6)
I believe the answer is:
gibson
'grabbing bass guitar' is the definition.
I can't judge whether this defines the answer.
'joe finally starts playing' is the wordplay.
'joe' becomes 'gib' (I can't explain this - if you can you should believe this answer much more).
'finally' suggests the final letters.
'playing' becomes 'on' (on can mean playing or performing).
The final letter of 'starts' is 's'.
'gib'+'s'+'on'='GIBSON'
'after' acts as a link.
Can you help me to learn more?
(Other definitions for gibson that I've seen before include "Guy as war hero" , "Mel - - , actor/movie maker" , "Mel ...... is Australian film star" .)