Like the scent obtained in Cairo: terribly dull (8)
I believe the answer is:
aromatic
'like the scent obtained' is the definition.
I can't judge whether this defines the answer.
'in cairo terribly dull' is the wordplay.
'in' is an insertion indicator.
'terribly' is an anagram indicator.
'dull' becomes 'mat' (mat as opposed to glossy).
'cairo' is an anagram of 'aroic'.
'aroic' placed around 'mat' is 'AROMATIC'.
Can you help me to learn more?
(Other definitions for aromatic that I've seen before include "Perfumed" , "Giving off an exotic fragrance" , "with a nice bouquet" , "Pleasant sort of smell from Cairo mat" , "Sweet-scented" .)