The most common and most likely answer to this crossword clue is the 11 letter word OMNIPRESENT
I've seen this crossword clue in The Times
O
M
N
I
P
R
E
S
E
N
T
More clues leading to the result OMNIPRESENT
- Person met in travelling everywhere at once
- Ubiquitous old politician with grudge about Islington area
- Doctor knocked back drink, once again dispatched everywhere
- Prosciutto starter and minestrone soup are never off the menu
- Doctor met in person — one way to describe God
- Order gift containing new one that’s always there
Buddy explains!

The straight part
We know that "Ubiquitous" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ubiquitous = omnipresent.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 OMNIPRESENT mean?
OMNIPRESENT adjective- Being everywhere simultaneously