The most common and most likely answer to this crossword clue is the 9 letter word HICCUPPED
I've seen this crossword clue in The Times
H
I
C
C
U
P
P
E
D
Buddy explains!

The straight part
We know that "Was glitchy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case was glitchy = hiccupped.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.
What does HICCUPPED mean?
HICCUPPED verb- To produce a hiccup; have the hiccups.
- To say with a hiccup.
- To produce an abortive sound like a hiccup.