Veronica, a small creeping plant (9)
I believe the answer is:
speedwell
This clue is a double definition.
'veronica' is the first definition.
(speedwell can mean a veronica plant)
'a small creeping plant' is the second definition.
(I've seen this before)
(Other definitions for speedwell that I've seen before include "Small blue flower of the genus veronica" , "bloomer?" , "Flowering plant" , "Small plant, veronica" , "Small creeping herbaceous plant with blue or pink flowers" .)