Bloomer occurring more regularly, we hear (6)
I believe the answer is:
dahlia
'bloomer' is the definition.
(dahlia is a kind of flowering plant)
I don't understand the remainder of the clue.
(Other definitions for dahlia that I've seen before include "Lia had this flower, strangely" , "Flower with pompom variety" , "Showy, big-headed autumn flower" , "Plant with tuberous roots and showy coloured flower heads" , "Ali had (anag) - showy flower" .)