In the recent “crossword peeves” thread I mentioned the use of “extremely” as a selection indicator for outside letters (an example of which we see here) as one of mine.
Azed agrees… in the 1186 slip he wrote - “I have noticed a growing tendency among crossword setters to use “extremely” to indicate the first and last letters of the following (or preceding) word, but can see no justification for it.
“Extremely” means “in an extreme way; very” and I can’t equate that with an instruction to the solver to take the extreme letters of a word.”