Flower beloved by prince? (5,7)
I believe the answer is:
sweet william
'flower' is the definition.
(sweet William is a kind of flower)
'beloved by prince?' is the wordplay.
'beloved' becomes 'sweet'.
'by' says to put letters next to each other.
'prince?' becomes 'William' (Prince William).
'sweet'+'william'='SWEET-WILLIAM'
(Other definitions for sweet william that I've seen before include "Plant with clusters of coloured flowers - WWI allies met (anag)" , "description Violet Elizabeth wouldn't have recognised?" , "Garden pink with clusters of vivid flowers" , "Garden pink -- Willie wet Sam (anag)" , "Flowering plant - Prince at sixteen?" .)