In brothers’ house cultivate liliaceous plant (10)
I believe the answer is:
fritillary
'liliaceous plant' is the definition.
The definition and answer can be both plants as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'in brothers' house cultivate' is the wordplay.
'in' is an insertion indicator.
'brothers' house' becomes 'friary' (friary is a kind of house. I am not sure about the 'brothers'' bit.).
'cultivate' becomes 'till' (I've seen this before).
'friary' placed around 'till' is 'FRITILLARY'.
Can you help me to learn more?
(Other definitions for fritillary that I've seen before include "Sort of lily" , "Butterfly" , "Plant of the lily family" .)