Floor without independent opening to the sky (6)
I believe the answer is:
window
'opening to the sky' is the definition.
I can't judge whether this defines the answer.
'floor without independent' is the wordplay.
'floor' becomes 'wow' (I've seen this in another clue).
'without' is an insertion indicator ('without' can be similar in meaning to 'outside').
'independent' becomes 'ind' (I've seen this in other clues).
'wow' going around 'ind' is 'WINDOW'.
Can you help me to learn more?
(Other definitions for window that I've seen before include "Glass aperture" , "One furthest from the aisle?" , "See 8" , "Transparent opening" , "Opening in a wall" .)