Succeed with technology? You're joking! (4,3,2)
I believe the answer is:
come off it
'you're joking' is the definition.
'succeed with technology?' is the wordplay.
'succeed' becomes 'comeoff' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'technology?' becomes 'it'.
'comeoff'+'it'='COME OFF IT!'
(Other definitions for come off it that I've seen before include "Don't make me laugh" , "Don't talk rubbish" , "get down from there" , "Don't be ridiculous!" , "You're mad!" .)