Passage leads to ancient, legendary location encircling Yemen’s wadis, ending in Sana’a yard (8)
I believe the answer is:
alleyway
'passage' is the definition.
(I've seen this before)
'leads to ancient legendary location encircling yemen's wadis ending in sana'a yard' is the wordplay.
'leads to' indicates taking the first letters.
'encircling yemen's wadis' becomes 'eyw' (this might be a standard abbreviation I've not previously seen).
'ending in' indicates one should take the final letters.
'yard' becomes 'y'.
The initial letters of 'ancient legendary location' is 'all'.
The final letter of 'sanaa' is 'a'.
'all'+'eyw'+'a'+'y'='ALLEYWAY'
Can you help me to learn more?
(Other definitions for alleyway that I've seen before include "Path between buildings" , "Corridor" , "Passage between buildings" , "Narrow passage" , "narrow lane" .)