The most common and most likely answer to this crossword clue is the 4 plus 5 letter word EASY RIDER
E
A
S
Y
R
I
D
E
R
More clues leading to the result EASY RIDER
- Is ready to edit royal film
- Duck taking in a second year film
- Film horse-trader’s plug for docile pony
- Ray, trembling with desire, producing rebel movie
- Simple addition to contract for film
- Picture a walk in the park near rivers full of fish
- See [explosive] diary edited by Republican becoming film
- Eastern Arab state following cycling with the German film about bikes
- Film duck eating edge of sandwich in Scottish town
- One who doesn't sit hard on a mount
Buddy explains!

The straight part
We know that "film about bikes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case film about bikes = easy rider.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.