Map of factory, incomplete (4)
I believe the answer is:
plan
'map' is the definition.
(I've seen this in another clue)
'factory incomplete' is the wordplay.
'factory' becomes 'plant' (I've seen this before).
'incomplete' means to remove the last letter.
'plant' with its last letter taken away is 'PLAN'.
'of' acts as a link.
(Other definitions for plan that I've seen before include "Schedule" , "Detailed proposal" , "Blueprint" , "Map; intention" , "Scheme, design" .)