Cooker put on time program? (6)
I believe the answer is:
applet
'program?' is the definition.
'cooker put on time' is the wordplay.
'cooker' becomes 'apple' ('cooker' can mean a cooking apple).
'put on' is a charade indicator (letters next to each other).
'time' becomes 't'.
'apple'+'t'='APPLET'
(Other definitions for applet that I've seen before include "modest programme" , "Computer application, sounds like small fruit" , "Java program" , "limited application of computing" .)