Magnificent morning for an old lady (7)

I believe the answer is:

grandam

'for an old lady' is the definition.
(thesaurus)

'magnificent morning' is the wordplay.
'magnificent' becomes 'grand' (I've seen this in another clue).
'morning' becomes 'am' (as in 12:00 AM).
'grand'+'am'='GRANDAM'

(Another definition for grandam that I've seen is " Experienced old woman".)

I've seen this clue in The Globe and Mail.

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