The "D" of PRNDL (5)
I believe the answer is:
drive
'the d of prndl' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for drive that I've seen before include "Avenue" , "Chauffeur -- force" , "demand for chauffeur" , "Pilot a 4x4" , "Impetus; take car" .)