Director finished with lists completely (4,4,5)
I believe the answer is:
head over heels
'completely' is the definition.
(I've seen this before)
'director finished with lists' is the wordplay.
'director' becomes 'head' (I've seen this in another clue).
'finished' becomes 'over' (over can mean finished or ended).
'with' means one lot of letters go next to another.
'lists' becomes 'heels' (I've seen this before).
'head'+'over'+'heels'='HEAD-OVER-HEELS'
(Other definitions for head over heels that I've seen before include "Completely - turning as in a somersault" , "normally upright?" , "topsy-turvy" , "(In relation to love) madly" , "In disorderly haste" .)