Keeps most movie trailers for Speed (5)
I believe the answer is:
haste
'ispeedi' is the definition.
I can't judge whether this defines the answer.
'keeps most movie trailers for' is the wordplay.
'keeps' becomes 'has' (keep can mean to have or possess).
'most' means to remove the first letter.
'movie' becomes 'ET'.
'trailers for' becomes 'e' (I can't explain this - if you can you should believe this answer much more).
'et' with its initial letter removed is 't'.
'has'+'t'+'e'='HASTE'
Can you help me to learn more?
(Other definitions for haste that I've seen before include "''Marry in . . . . ., repent at leisure''" , "Expedition" , "Excessive speed or urgency" , "dispatch" , "Promptitude" .)