Order in which a brilliant clue delivers eventually (10)
I believe the answer is:
alphabetic
'order in' is the definition.
Although both the answer and definition are adjectives, I cannot understand how one could define the other.
'a brilliant clue delivers eventually' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'alpha' (the Greek letter A) and 'alpha' is found within the answer.
This explanation may well be incorrect...
'which' acts as a link.
Can you help me to learn more?
(Other definitions for alphabetic that I've seen before include "like characters in a demo" , "in conventional order" , "showing certain things in their natural order?" , "with a first, etc" .)