Boy from Baltimore (3)
I believe the answer is:
tim
'boy' is the definition.
'from baltimore' is the wordplay.
'from' says the answer is hidden in the clue.
'TIM' is hidden in the letters of 'baltimore'.
(Other definitions for tim that I've seen before include "Tiny ..., endearing Dickens boy" , "-- Brooke-Taylor, comic" , "Tiny Dickens boy from 'A Christmas Carol'" , "Tiny chap" , "Tiny . . . is a loveable Dickens boy" .)