It's possibly blooming nice prince? (5,7)

I believe the answer is:

sweet william

'it's possibly blooming' is the definition.
(sweet william is a type of flower)

'nice prince?' is the wordplay.
'nice' becomes 'sweet' (both can mean agreeable or pleasant).
'prince?' becomes 'William' (Prince William).
'sweet'+'william'='SWEET-WILLIAM'

(Other definitions for sweet william that I've seen before include "bloomer" , "Eurasian plant with fragrant flowers" , "Flower (nice boy!)" , "Garden pink -- Willie wet Sam (anag)" , "Flowering plant - Prince at sixteen?" .)

I've seen this clue in The Telegraph.

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