Herb and one or two girls... (8)
I believe the answer is:
rosemary
I believe this is a double definition.
'herb' is the first definition.
(I know that rosemary is a type of herb)
'one or two girls' is the second definition.
(Rose and Mary or just Rosemary)
'and' is the link.
(Other definitions for rosemary that I've seen before include "such seasons" , "Fragrant evergreen shrub used in cooking" , "Plant" , "Herb - girl's name(s)" , "Grey-green herb" .)