Came blithely in like a breath of fresh air? (7)

'came blithely' is the definition.
The answer and definition can be both to do with motion as well as being past participle verbs.
Perhaps you can see a link between them that I can't see?

'like a breath of fresh air?' is the wordplay.
I cannot quite understand how this works, but
'air?' could be 'breeze' ('breeze' can be a synonym of 'air') and 'breeze' is found within the answer.
A single letter 'd' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

'in' is the link.

Can you help me to learn more?