Pie aunt made as a bloomer (7)
I believe the answer is:
petunia
'a bloomer' is the definition.
(petunia is a kind of flowering plant)
'pie aunt made' is the wordplay.
'made' indicates anagramming the letters.
'pie'+'aunt'='pieaunt'
'pieaunt' with letters rearranged gives 'PETUNIA'.
'as' acts as a link.
(Other definitions for petunia that I've seen before include "Bloomer" , "Garden plant, originally from S. America" , "Garden plant with large funnel-shaped flower" , "Colourful" , "Flowering plant" .)