Freelancer's detail (4)
I believe the answer is:
spec
'freelancer's detail' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for spec that I've seen before include "glasses?" , "Required standard of workmanship" , "Description of requirements" , "Detailed design (colloq.)" , "Gamble (colloq.)" .)