Plant housed in another building (4)
I believe the answer is:
herb
'plant' is the definition.
(I know that herb is a plant)
'in another building' is the wordplay.
'in' says the answer is hidden in the clue.
'HERB' is hidden within 'another building'.
'housed' is the link.
This may not be right. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for herb that I've seen before include "ingredient for recipe?" , "Rosemary, for example" , "Mint possibly" , "Medicinal or culinary plant" , "eg Thyme, basil" .)