Plant is put back in store (7)
I believe the answer is:
deposit
'plant' 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 can't see?
'is put back in store' is the wordplay.
'put back' says the letters should be written in reverse.
'in' is an insertion indicator.
'store' becomes 'depot' (depot can mean a store or warehouse).
'is' backwards is 'si'.
'si' inserted inside 'depot' is 'DEPOSIT'.
Can you help me to learn more?
(Other definitions for deposit that I've seen before include "Put down - initial payment" , "Lay down" , "Put down - leave behind" , "Layer laid down" , "Set down" .)