The most common and most likely answer to this crossword clue is the 6 letter word TEDIUM
T
E
D
I
U
M
More clues leading to the result TEDIUM
- Note I’d backed with some hesitation brings boredom
- I’m nodding off with duet … causing this?
- Clairvoyant with time for married routine
- Unusually muted, embracing the speaker’s boredom
- Junk diet Greek character's given up in boredom
- Duet I cast prior to opening of musical routine?
- Note over start of unison breaking dull, monotonous quality
- Boredom means primarily being inactive after a little time
- Stomach having to accept Bedi, starting late, showing monotony
- Lack of variety from Hendrix, regularly stifled by pot?
Buddy explains!

The straight part
We know that "routine" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case routine = tedium.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 TEDIUM mean?
TEDIUM noun- Boredom or tediousness; ennui.