Quietly guide one towards seller (6)
I believe the answer is:
pusher
'seller' is the definition.
(I know that pusher is a type of dealer)
'quietly guide' is the wordplay.
'quietly' becomes 'p' (p for piano and quiet).
'guide' becomes 'usher' (an usher guides people).
'p'+'usher'='PUSHER'
'one towards' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for pusher that I've seen before include "Criminal who sells illegal drugs" , "Street seller of illegal drugs" , "See 20" , "A seller of drugs on the streets" .)