Relevant stuff (8)
I believe the answer is:
material
I believe this clue is a double definition.
'relevant' is the first definition.
(similar in meaning)
'stuff' is the second definition.
(I know this)
(Other definitions for material that I've seen before include "Matter; cloth" , "Directly relevant to a matter, in a law case perhaps" , "Fabric, stuff" , "Felt, perhaps" , "Fabric or other substance" .)