Organisation of space and length of entry to air passage (5)
I believe the answer is:
nasal
'organisation of space' is the definition.
The definition and answer can be both body parts as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'length of entry to air passage' is the wordplay.
'of entry' says to take the initial letters (I've seen 'entry' mean this).
'to' says to put letters next to each other (I've seen this in other clues).
'air passage' becomes 'nasa' (I can't explain this - if you can you should believe this answer much more).
The initial letter of 'length' is 'l'.
'l' after 'nasa' is 'NASAL'.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for nasal that I've seen before include "Nosey" , "Relating to one's hooter" , "Like some spray" , "Describing some hooter" , "of a prominent feature" .)