Concerned with morning sickness clutching a container (7)

I believe the answer is:

matinal

I'm a little stuck... Click here to teach me more about this clue!

'concerned with morning' is the definition.
I can't tell whether this defines the answer.

'sickness clutching a container' is the wordplay.
'sickness' becomes 'mal' (I've seen this before).
'clutching' means one lot of letters goes inside another.
'container' becomes 'tin' (tin is a kind of container**).
'a'+'tin'='atin'
'mal' enclosing 'atin' is 'MATINAL'.

Can you help me to learn more?

(Another definition for matinal that I've seen is " of morning prayer".)

I've seen this clue in The Telegraph.

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