Say how marvellous you are and stuff! (7)
I believe the answer is:
flannel
This might be a double definition.
'say how marvellous you are' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'stuff' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'and' acts as a link.
Can you help me to learn more?
(Other definitions for flannel that I've seen before include "type of fabric" , "Bathroom item" , "Cloth; evasive talk" , "nonsense" , "cooler if wet?" .)