No other movie leaves one cracking up and delighted (4,3,4)
I believe the answer is:
over the moon
'delighted' is the definition.
('over the moon' means very happy)
'no other movie leaves one cracking up' is the wordplay.
'leaves' indicates named letters should be taken away.
'one' becomes 'i' (Roman numeral).
'cracking up' indicates anagramming the letters (the original order breaks down or cracks up).
'no'+'other'+'movie'='noothermovie'
'noothermovie' with 'i' taken away is 'noothermove'.
'noothermove' is an anagram of 'OVER THE MOON'.
'and' acts as a link.
(Other definitions for over the moon that I've seen before include "Ecstatic" , "cock-a-hoop" , "euphoric" , "Greatly elated" , "Delighted - in football parlance!" .)