Digs ads showcasing Spielberg movie (7)
I believe the answer is:
billets
'digs' is the definition.
Although both the answer and definition are verbs in their -s form, I can't understand how one could define the other.
'ads showcasing spielberg movie' is the wordplay.
I cannot really understand how this works, but
'movie' could be 'et' and 'et' is present in the answer.
'ads' could be 'bills' (bill is a kind of ad) and 'bills' is found within the leftover letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for billets that I've seen before include "Soldiers' lodgings" , "Lodgings for the military" .)