Baby appears in this programme (5)
I believe the answer is:
sprog
'baby' is the definition.
(I've seen this before)
'in this programme' is the wordplay.
'in' indicates the answer is hidden within the clue.
'SPROG' is hidden within 'this programme'.
'appears' acts as a link.
(Other definitions for sprog that I've seen before include "little one" , "Child, colloquially" , "Infant" , "Child; recruit (mil. slang)" , "Baby (slang)" .)