Flower with blue and white roots (4)
I believe the answer is:
nile
'flower' is the definition.
(Nile is an example)
'blue and white roots' is the wordplay.
I cannot really see how this works, but
'and' could be 'n' (common abbreviation for 'and') and 'n' is located in the answer.
The remaining letters 'ile' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'with' acts as a link.
Can you help me to learn more?
(Other definitions for nile that I've seen before include "white flower?" , "Egyptian river" , "World's longest river" , "Line (anag)" , "River of Egypt" .)