Flower from boy accepted by girl (7)
I believe the answer is:
verbena
'flower' is the definition.
(verbena is a kind of flower)
'boy accepted by girl' is the wordplay.
'boy' becomes 'ben'.
'accepted by' indicates putting letters inside.
'girl' becomes 'vera' (**).
'ben' placed within 'vera' is 'VERBENA'.
'from' acts as a link.
(Other definitions for verbena that I've seen before include "Garden plant" , "Herbaceous plant" , "Vervain (plant)" , "Ornamental plant with showy flowers" , "Ornamental pant" .)