Drive-thru screens are fascinating (5)
I believe the answer is:
rivet
'are fascinating' is the definition.
(to rivet can mean to fascinate)
'drive-thru screens' is the wordplay.
'screens' indicates the answer is hidden within the clue.
'RIVET' can be found hidden inside 'drive thru'.
(Other definitions for rivet that I've seen before include "Type of fastening" , "Bolt for metal plates" , "join securely" , "Captivate" , "make fast" .)