Geisha’s artful display of her bloomers? (7)
I believe the answer is:
ikebana
'bloomers?' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see a link between them that I can't see?
'geisha's artful display of her' is the wordplay.
I cannot really understand how this works, but
'her' could be 'eba' and 'eba' is found in the answer.
This explanation may well be incorrect...
(Other definitions for ikebana that I've seen before include "craft" , "Art of Japanese flower arrangement" , "formal display" , "exhibiting array of bloomers" , "Flower arranging; In a bake (anag.)" .)