The most common and most likely answer to this crossword clue is the 7 letter word ALREADY
I've seen this crossword clue in The Times
A
L
R
E
A
D
Y
More clues leading to the result ALREADY
- A pound, cash thus far
- Meal setter put away, prepared beforehand
- Queen snubbed by lay reader unfortunately before
- A woman has received note by now
- Adult female holding on so soon
- Willing to support a student so soon
- By that time, a woman again is in occupation
- Study in a library that’s emptied so soon!
- A woman has come round about? So soon?
- Almost everyone prepared by the time in question
Buddy explains!

The straight part
We know that "thus far" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case thus far = already.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 ALREADY mean?
ALREADY adverb- Prior to some specified time, either past, present, or future; by this time; previously.
- So soon.
- An intensifier used to emphasize impatience or express exasperation.