The most common and most likely answer to this crossword clue is the 2 plus 7 letter word IN ARREARS
I've seen this crossword clue in Financial Times
I
N
A
R
R
E
A
R
S
More clues leading to the result IN ARREARS
- At home a brother finally raises being behind withpayments
- Trendy auditors pinching a bishop's behind
- Revolutionary princess rises up behind
- Behind or up-to-date? Behind, stopping behind mostly
- Behind upstanding king and queen, pair listening?
- At home, a Right Reverend mixed up ‘arse’ and ‘behind‘
- Rain’s rare for resort, but overdue
- With it, artist flips and brings up behind
- Indian queen reversing, backs behind
- Popular listeners after arrival may be overdue
Buddy explains!

The straight part
We know that "overdue" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case overdue = in arrears.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.