Speak about a new mode eventually (4,3)

I believe the answer is:

some day

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'eventually' is the definition.
Both the answer and definition are adverbs. Perhaps they are linked in a way I don't understand?

'speak about a new mode' is the wordplay.
'speak' becomes 'say' (I've seen this in other clues**).
'about' is an insertion indicator.
'a new' indicates anagramming the letters.
'mode' with letters rearranged gives 'omed'.
'say' going around 'omed' is 'SOME DAY'.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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