What does the cryptic crossword clue "Cult film's undemanding added condition (4,5)" mean?

The wordplay uses a charade (building blocks). EASY (synonym="undemanding") + RIDER (synonym="added condition") = EASYRIDER The answer is EASYRIDER.

Cult film's undemanding added condition (4,5)

Guardian Cryptic #29198 | 5 Down | 2023-10-11 flower