In a confident sort of way, no doubt (9)

I believe the answer is:

assuredly

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'no doubt' is the definition.
Both the definition and answer are adverbs. Maybe you can see a link between them that I don't see?

'in a confident sort of way' is the wordplay.
'in' is an insertion indicator.
'confident' becomes 'sure' (similar in meaning).
'sort of' becomes 'dly' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'way' becomes 's' (Compass direction - South).
'a'+'sure'+'dly'='asuredly'
'asuredly' enclosing 's' is 'ASSUREDLY'.

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I've seen this clue in the Evening Standard.

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