Visualise structure that might be used in gallery (7,5)
I believe the answer is:
picture frame
'used in gallery' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'visualise structure' is the wordplay.
'visualise' becomes 'picture' (synonyms).
'structure' becomes 'frame' (frame is a kind of structure).
'picture'+'frame'='PICTURE-FRAME'
'that might be' is the link.
Can you help me to learn more?
(Other definitions for picture frame that I've seen before include "mounting" , "Painting's mount" .)