The woman, who cannot be named, claims Clifford indecently assaulted her in 1966 after the pair met at a Wimpy bar in south west London, jurors at Southwark Crown Court were told.
She said that after offering her a lift home, he drove her to an alleyway near a sports field, saying he had something to show her.
The court heard that he produced a book of photographs of him with celebrities including the Beatles and the Rolling Stones, and she said she would like to meet the Walker Brothers.
The woman said: "He said 'I can arrange that, but this is what you've got to do', and he put my seat right back and then he tried for force himself upon me, basically.
"My seat, I think it went almost horizontal, he then sort of lunged at me and put his body on me. He was touching me all over."
Clifford, wearing a navy jacket, white shirt and striped tie with grey trousers, listened through a hearing loop from the dock.
The woman said: "I was sort of on autopilot, 'How I can get away from here', and it was quite obvious what he wanted to do.
"I thought at the time I was going to get raped if I didn't get out of the car, I was just thinking about escape."
She told the court she managed to open the car door and ran home.
The woman said she felt "lucky" to have got away.
The woman said she had told friends about what happened, but did not go to the police until recently.