Plant is set up in store (7)
I believe the answer is:
deposit
'plant' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'is set up in store' is the wordplay.
'set up' is a reversal indicator (in a down clue, letters go up).
'in' indicates putting letters inside.
'store' becomes 'depot' (depot can mean a store or warehouse).
'is' back-to-front is 'si'.
'si' placed inside 'depot' is 'DEPOSIT'.
Can you help me to learn more?
(Other definitions for deposit that I've seen before include "Down payment made to secure goods" , "Layer laid down" , "(Money or mineral) put down" , "Lodge money in bank account" , "I posted (anag.)" .)