One who makes a resting-place for solemn Australian (11)
I believe the answer is:
gravedigger
'one who makes a resting-place' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'solemn australian' is the wordplay.
'solemn' becomes 'grave' (grave can mean solemn or serious).
'australian' becomes 'digger' (term for an Australian soldier in World War I).
'grave'+'digger'='GRAVEDIGGER'
'for' is the link.
Can you help me to learn more?
(Other definitions for gravedigger that I've seen before include "One unearthing a plot" , "part in Hamlet" , "working in churchyard?" , "Cemetery worker" , "Sexton" .)