Charlie, neglected, gets surly (6)
I believe the answer is:
crusty
'surly' is the definition.
(thesaurus)
'charlie neglected' is the wordplay.
'charlie' becomes 'C' (phonetic alphabet).
'neglected' becomes 'rusty' (I've seen this in another clue).
'c'+'rusty'='CRUSTY'
'gets' acts as a link.
(Other definitions for crusty that I've seen before include "Cross or harsh, like outer layer of loaf" , "Curtsy (anag.)" , "bloomer like this?" , "Sour and brusque, like outer part of bread" , "Short" .)