Area of France featuring in some documentaries (5)
I believe the answer is:
'area of france' is the definition.
(Medoc is a region of France)
'in some documentaries' is the wordplay.
'in' says the answer is hidden in the clue.
'MEDOC' can be found hidden inside 'some documentaries'.
'featuring' acts as a link.
(Other definitions for medoc that I've seen before include "French intoxicant" , "Wine-growing area" , "Type of wine" , "region of France" , "Red wine from southwest France" .)