Made water flow under small flower (9)
I believe the answer is:
speedwell
'flower' is the definition.
(I know that speedwell is a type of flower)
'made water flow under small' is the wordplay.
'made water' becomes 'peed' ('pee' can be a synonym of 'make water').
'flow' becomes 'well' (I am not sure about this - if you are sure you should believe this answer much more).
'under' means one lot of letters go next to another.
'small' becomes 's' (abbreviation - e.g. clothes size).
'peed'+'well'='peedwell'
'peedwell' after 's' is 'SPEEDWELL'.
Can you help me to learn more?
(Other definitions for speedwell that I've seen before include "bloomer?" , "Small creeping herbaceous plant with blue or pink flowers" , "Flowering plant" , "Small blue flower of the genus veronica" , "Small plant, veronica" .)