The most common and most likely answer to this crossword clue is the 8 letter word MEGAFLOP
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More clues leading to the result MEGAFLOP
Buddy explains!

The straight part
We know that "hopeless movie" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hopeless movie = megaflop.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does MEGAFLOP mean?
MEGAFLOP noun- Megaflops (one million FLOPS, or floating point operations per second)
- A major flop; a film or other production that is a great failure.