Open-air types will be out of these (5)
I believe the answer is:
doors
'open-air types' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Maybe there's an association between them I don't understand?
'out of these' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is found in the answer.
The remaining letters 'dors' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'will be' is the link.
Can you help me to learn more?
(Other definitions for doors that I've seen before include "Openings" , "Swinging or sliding barriers" , "Barriers to entrances" , "Portals" , "Ways in and out" .)