Flower for girl - princess, say (10)
I believe the answer is:
pennyroyal
'flower' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'girl princess say' is the wordplay.
'girl' becomes 'Penny' (woman's name).
'princess say' becomes 'royal' (princess is a kind of royal).
'penny'+'royal'='PENNYROYAL'
'for' is the link.
Can you help me to learn more?
(Other definitions for pennyroyal that I've seen before include "Plant used in herbal medicine (part of the queen's shilling?)" , "Small plant of mint family" , "medicinal plant" .)