The answer length for each of the following may be different because another word may replace it in the grid.
1. Vital juice for a French digger (7)
23 Scots knew this was used for leaping ditches in Ayr (6)
39 Fix road missing third strip of iron (7)
43 Very popular European grape producer (7)
Thanks everyone.
I did find grid entries for sapper, kent and vine.
Had to google the original answer with the connecting word and find the grid entry.
I have grid entry to 20d but not the original answer.