Least demanding exam spanning the morning (6)

I believe the answer is:

tamest

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'least demanding' is the definition.
I can't tell whether this defines the answer.

'exam spanning the morning' is the wordplay.
'exam' becomes 'test' (synonyms).
'spanning' is an insertion indicator.
'the morning' becomes 'am' (as in 12:00 AM).
'test' placed around 'am' is 'TAMEST'.

Can you help me to learn more?

(Other definitions for tamest that I've seen before include "Most docile" , "Meekest or least wild" , "Most restrained or quiet" , "Least wild, most domesticated" , "Least exciting" .)

I've seen this clue in The Independent.

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