Hi Ethereal,
I cobbled together a list of terms when I was starting out, I’ll copy it below. Others may be able to add to it. For the background to “Nina” look up “Al Hirschfeld” on Wikipedia (Nina was his daughter).
FOI - First One In
LOI - Last One In
COD - Clue Of (the) Day
DD - Double Definition
CD - Cryptic definition
PDM - Penny Drop Moment
DBE - Definition By Example
Anagrind - Anagram Indicator
Anagrist - Anagram fodder
Nina - A hidden message in the unchecked (unches) letters of the grid
DNF - Did Not Finish
BRB - Big Red Book (Chambers Dictionary)
CAD - Clue-As-Definition. Also known as “&Lit” (and literally)
WIA - Wordplay in answer (also known as a reverse clue)
225 - The fifteensquared blog