Former name of Red Sea country having deep chasm in one area (9)
I believe the answer is:
abyssinia
'former name of red sea country' is the definition.
I can't judge whether this definition defines the answer.
'deep chasm in one area' is the wordplay.
'deep chasm' becomes 'abyss' (I've seen this in another clue).
'one' becomes 'i' (Roman numeral).
'area' becomes 'a' (maths abbreviation).
'abyss'+'in'+'i'+'a'='ABYSSINIA'
'having' acts as a link.
Can you help me to learn more?
(Other definitions for abyssinia that I've seen before include "What became Ethiopia" , "Former nation" , "Former name of northeast African country" , "Ethiopia, formerly" , "nation of old" .)