Some diplomat in Algiers of a morning (7)

I believe the answer is:

matinal

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'some diplomat in algiers of a morning' is the definition.
I can't tell whether this definition defines the answer.

'some diplomat in algiers of' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'MATINAL' is hidden within 'diplomat in algiers of'.

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

I've seen this clue in The Sunday Times.

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