Indoor plant could create a sad spirit (10)
I believe the answer is:
aspidistra
'indoor plant' is the definition.
(I've seen this before)
'create a sad spirit' is the wordplay.
'create' indicates anagramming the letters.
'a'+'sad'+'spirit'='asadspirit'
'asadspirit' is an anagram of 'ASPIDISTRA'.
'could' is the link.
(Other definitions for aspidistra that I've seen before include "Iris adapts (anag) - indoor plant" , "Star is paid (anag) - plant" , "Large houseplant" , "something normally developed in-house?" , "The biggest - (in the world) (Gracie Fields)" .)