Attempt artwork again and screw up (6)
I believe the answer is:
redraw
'attempt artwork again' is the definition.
(to draw again)
'screw up' is the wordplay.
'screw' becomes 'warder' ('screw' is an informal term for a prison warder).
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'warder' back-to-front is 'REDRAW'.
'and' is the link.
(Other definitions for redraw that I've seen before include "Adjust" , "Delineate again" , "Find a new winner" , "Sketch again" , "plan afresh" .)