The most common and most likely answer to this crossword clue is the 7 plus 5 letter word VARIETY SHOWS
I've seen this crossword clue in The Daily Telegraph
V
A
R
I
E
T
Y
S
H
O
W
S
More clues leading to the result VARIETY SHOWS
Buddy explains!
The straight part
We know that "All the same, they’re evidently not routine presentations" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case all the same, they’re evidently not routine presentations = variety shows.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.