The 75-year-old singer worked with the former Smiths frontman and her ex-neighbour on 2004 track 'Let Me Kiss You', which was penned by the eccentric star, and she learned a lot from him.
She said: ''He was my best mentor in a way because he didn't have the self-serving thing that Lee [Hazlewood] had.''
Though Nancy likes Morrissey's version of 'Let Me Kiss You', she thinks she did it better.
She said: ''I like mine better. So does he!''
However, the 'These Boots Are Made For Walkin'' hitmaker has lost touch with her pal in recent years and is desperate to reconnect with the singer.
She said: ''I miss him. I can't find him. Maybe you should write that for me: where are you? Get in touch!''
Nancy's earlier career success was partly guided by Lee Hazlewood, and her famous father, late singing legend Frank Sinatra, was delighted with her soul-influenced pop sound.
She admitted to The Times newspaper: ''He was thrilled. He owned the label [Reprise] -- he wanted the records to sell.''
Though she still enjoys performing, Nancy expects her tour next year to be her last.
She said: ''I think it's my last chance. I can't imagine doing 'These Boots Were Made for Walkin'' on a walker!''
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