Fat contributing to vascular deterioration? (4)
I believe the answer is:
lard
'fat' is the definition.
(I know that lard is a type of edible fat)
'contributing to vascular deterioration?' is the wordplay.
'contributing to' indicates the answer is hidden within the clue (the answer contributes to part of the clue ).
'LARD' can be found hidden inside 'vascular deterioration'.
(Other definitions for lard that I've seen before include "Fat Scottish landowner appears disheartened" , "Aggrandise - embellish" , "Hard cooking fat" , "Pig-fat" , "White cooking fat" .)