To take a rich husband, they say, may be a bloomer (8)
I believe the answer is:
marigold
'a bloomer' is the definition.
(marigold is a kind of flowering plant)
'to take a rich husband they say may be' is the wordplay.
I cannot quite see how this works, but
'take' could be 'r' (recipe is latin for take - r is abbreviation) and 'r' is present in the answer.
'a' is within the answer.
'be' could be 'go' (going is a kind of being) and 'go' is found in the answer.
The remaining letters 'mild' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
(Other definitions for marigold that I've seen before include "Orange-flowered plant" , "Yellow or orange flower" , "Bright orange-yellow garden flower" , "The flower has a gold rim, oddly" , "Garden plant of the daisy family" .)