Bob Cratchit's son (4,3)
I believe the answer is:
tiny tim
'bob cratchit's son' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tiny tim that I've seen before include "Lovable boy in Dickens novel ` `A Christmas Carol' '" , "Invalid 16 [CRATCHIT]" , "Cratchit's youngest (C. Carol)" , "Dickens mite" , "Poor little kid" .)