Mother with outfit -- ancient bloomer (8)
I believe the answer is:
marigold
'bloomer' is the definition.
(I know that marigold is a type of bloomer)
'mother with outfit ancient' is the wordplay.
'mother' becomes 'ma' (ma can mean mother).
'with' says to put letters next to each other.
'outfit' becomes 'rig' (synonyms).
'ancient' becomes 'old' (similar in meaning).
'ma'+'rig'+'old'='MARIGOLD'
(Other definitions for marigold that I've seen before include "Garden plant of the daisy family" , "Yellow or orange flower" , "Orange-flowered plant" , "floral item" , "Orange daisy" .)