The most common and most likely answer to this crossword clue is the 4 plus 3 letter word BAIL OUT
I've seen this crossword clue in The Times
B
A
I
L
O
U
T
Buddy explains!

The straight part
We know that "Withdraw/finance in a tricky situation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case withdraw/finance in a tricky situation = bail out.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 BAIL OUT mean?
BAIL OUT noun- A rescue, especially a financial rescue.
- The process of exiting an aircraft while in flight.
- (underwater diving) A backup supply of air in scuba diving.