Quiet morning is a fiction (4)
I believe the answer is:
sham
'a fiction' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'quiet morning' is the wordplay.
'quiet' becomes 'sh' (both can be said to tell someone to be quiet).
'morning' becomes 'am'.
'sh'+'am'='SHAM'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for sham that I've seen before include "Pretence; bogus, false" , "Cheap falseness" , "Not what it seems to be" , "imitation" , "Phoney sort of hams" .)