Clementine Lane in Mt Pleasant – Named after Clementine Way, a street in the Wellington suburb of Chartwell. Cannon Estate Ltd., developers of the subdivision where this street was formed, also developed Chartwell in Wellington. Chartwell in Kent, England was the family home of Sir Winston Churchill (1864- 1975) and his wife, Clementine. Named in 1967 and first appears in street directories in 1972.
A small amount of information from the library website and nothing that I can add about the name of the street.
Not much information on Papers Past and there was mostly ads for houses and sections plus a few death notices. Most houses here were built in 1970s but most looked more modern. There wasn’t a footpath on this street but it was a narrow one.
Lytteltonwitch's Walking the streets of Christchurch Project 