Prudish woman making bloomer (8)
I believe the answer is:
primrose
'bloomer' is the definition.
(I know that primrose is a type of bloomer)
'prudish woman' is the wordplay.
'prudish' becomes 'prim' (synonyms).
'woman' becomes 'rose' ().
'prim'+'rose'='PRIMROSE'
'making' acts as a link.
(Other definitions for primrose that I've seen before include "Woodland plant with pale yellow flowers" , "something in the bed!" , "Spring woodland flower" , "Yellow spring flower from promiser" , "Pale yellow- a primula" .)