Jot down the first nine letters (4)
I believe the answer is:
iota
This clue might be a double definition.
'jot' is the first definition.
(I've seen this before)
'down the first nine letters' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
Can you help me to learn more?
(Other definitions for iota that I've seen before include "Greek letter; tiny amount" , "Greek letter - small quantity" , "European letter" , "letter from Greece" , "Tiny or scarcely detectable amount" .)