Blooming awful louts! (5)
I believe the answer is:
lotus
'blooming' is the definition.
(I have seen 'A blooming' mean 'lotus' so perhaps 'blooming' could also mean 'lotus')
'awful louts' is the wordplay.
'awful' indicates anagramming the letters.
'louts' anagrammed gives 'LOTUS'.
(Other definitions for lotus that I've seen before include "Exotic flower" , "Aquatic plant" , "TREE" , "Cross-legged position adopted in yoga" , "Mythological fruit - lily" .)