Flighty in a fanciful way, but they have saintly manners (6)
I believe the answer is:
stairs
'flighty in a fanciful' is the definition.
I can't judge whether this definition defines the answer.
'way but they have saintly manners' is the wordplay.
I cannot quite understand how this works, but
'way' could be 'st' (abbreviation for street) and 'st' is present in the answer.
'manners' could be 'airs' (air is a kind of manner) and 'airs' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for stairs that I've seen before include "Series of steps" , "A set of rising steps" , "Flights of steps" , "Way between floors" , "Interior means of ascent" .)