The most common and most likely answer to this crossword clue is the 6 letter word RATIFY
I've seen this crossword clue in Financial Times
R
A
T
I
F
Y
More clues leading to the result RATIFY
- Sign off please when the leader has departed
- OK swimmer keeping in trim, doing the backstroke?
- Approve first of great escapes please
- Approve traitor on condition that morality is finally observed
- Confirm man has been gripped by rising spell of uncontrollable laughter? On the contrary
- Approve of note received by fliers? Yes, at first
- Confirm suitable returns in fish
- Endorse note slipped into fliers yesterday
- Confirm shaft must contain suitable return
- Agree to spy, if it’s the Fourth of July
Buddy explains!

The straight part
We know that "Pass" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pass = ratify.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 RATIFY mean?
RATIFY verb- To give formal consent to; make officially valid, sign off on.