Heading west, occasionally picking banjo I lug on board (5)
I believe the answer is:
ouija
'board' is the definition.
(Ouija is an example)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for ouija that I've seen before include "Medium's medium?" , "- Board may be used in a seance" , "(Seance) lettered board" , "This board is used in spiritualistic sessions" , "Occult board" .)