Plan detail, for short (4)
I believe the answer is:
spec
'plan detail for short' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for spec that I've seen before include "on which one takes a gamble" , "Awkward, clumsy" , "Detailed description of design criteria (abbr)" , "Estimate" , "Requirement" .)