Insufficiency in supply of scenes with cars crashing (10)
I believe the answer is:
scarceness
'insufficiency' is the definition.
(I know that scarceness is a type of insufficiency)
'supply of scenes with cars crashing' is the wordplay.
'supply of' indicates anagramming the letters (I've seen 'supply' mean this (in a supple way)).
'with' is a charade indicator (letters next to each other).
'crashing' indicates anagramming the letters.
'scenes' is an anagram of 'ceness'.
'cars' anagrammed gives 'scar'.
'ceness' after 'scar' is 'SCARCENESS'.
'in' is the link.
(Other definitions for scarceness that I've seen before include "deficiency" , "Shortage" , "that leaves one wanting" .)