Crossword Genius

Quiet morning is a fiction (4)

Ross

I believe the answer is:

sham

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'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" .)

I've seen this clue in the Sydney Morning Herald.
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