Shabby, long-haired person tossed tin in, Bill! (7)
I believe the answer is:
beatnik
'shabby long-haired person' is the definition.
'beatnik' can be an answer for 'person' (beatnik is a kind of person). I'm not certain of the 'shabby long-haired' bit.
'tossed tin in bill' is the wordplay.
'tossed' indicates anagramming the letters.
'in' indicates putting letters inside.
'bill' becomes 'beak' (synonyms).
'tin' with letters rearranged gives 'tni'.
'tni' going into 'beak' is 'BEATNIK'.
Can you help me to learn more?
(Other definitions for beatnik that I've seen before include "Unconventional young scruff" , "Fifties rebel" , "Young person of the '50s and '60s" , "Social rebel of the 1950s" , "Rebellious youth (dated)" .)